diff --git a/jenkinsapi/utils/requester.py b/jenkinsapi/utils/requester.py
index a51bf0a..5dd0716 100644
--- a/jenkinsapi/utils/requester.py
+++ b/jenkinsapi/utils/requester.py
@@ -40,23 +40,42 @@ class Requester(object):
 
     def __init__(self, *args, **kwargs):
 
-        if args:
-            try:
-                username, password = args
-            except ValueError as Error:
-                raise Error
-        else:
-            username = None
-            password = None
-
-        baseurl = kwargs.get('baseurl', None)
+        username = None
+        password = None
+        ssl_verify = True
+        cert = None
+        baseurl = None
+        timeout = 10
+
+        if len(args) == 1:
+            username, = args
+        elif len(args) == 2:
+            username, password = args
+        elif len(args) == 3:
+            username, password, ssl_verify = args
+        elif len(args) == 4:
+            username, password, ssl_verify, cert = args
+        elif len(args) == 5:
+            username, password, ssl_verify, cert, baseurl = args
+        elif len(args) == 6:
+            username, password, ssl_verify, cert, baseurl, timeout = args
+        elif len(args) > 6:
+            raise ValueError("To much positional arguments given!")
+
+        baseurl = kwargs.get('baseurl', baseurl)
         self.base_scheme = urlparse.urlsplit(
             baseurl).scheme if baseurl else None
-        self.username = username
-        self.password = password
-        self.ssl_verify = kwargs.get('ssl_verify', True)
-        self.cert = kwargs.get('cert', None)
-        self.timeout = kwargs.get('timeout', 10)
+        self.username = kwargs.get('username', username)
+        self.password = kwargs.get('password', password)
+        if self.username:
+            assert self.password, 'Please provide both username and password '\
+                                   'or don\'t provide them at all'
+        if self.password:
+            assert self.username, 'Please provide both username and password '\
+                                   'or don\'t provide them at all'
+        self.ssl_verify = kwargs.get('ssl_verify', ssl_verify)
+        self.cert = kwargs.get('cert', cert)
+        self.timeout = kwargs.get('timeout', timeout)
 
     def get_request_dict(
             self, params=None, data=None, files=None, headers=None, **kwargs):

diff --git a/jenkinsapi_tests/unittests/test_requester.py b/jenkinsapi_tests/unittests/test_requester.py
index 2f810d9..a0fe4ab 100644
--- a/jenkinsapi_tests/unittests/test_requester.py
+++ b/jenkinsapi_tests/unittests/test_requester.py
@@ -5,6 +5,115 @@ from jenkinsapi.jenkins import Requester
 from jenkinsapi.custom_exceptions import JenkinsAPIException
 
 
+def test_no_parameters_uses_default_values():
+    req = Requester()
+    assert isinstance(req, Requester)
+    assert req.username is None
+    assert req.password is None
+    assert req.ssl_verify
+    assert req.cert is None
+    assert req.base_scheme is None
+    assert req.timeout == 10
+
+
+def test_all_named_parameters():
+    req = Requester(username='foo', password='bar', ssl_verify=False,
+                    cert='foobar', baseurl='http://dummy', timeout=5)
+    assert isinstance(req, Requester)
+    assert req.username == 'foo'
+    assert req.password == 'bar'
+    assert not req.ssl_verify
+    assert req.cert == 'foobar'
+    assert req.base_scheme == 'http', 'dummy'
+    assert req.timeout == 5
+
+
+def test_mix_one_unnamed_named_parameters():
+    req = Requester('foo', password='bar', ssl_verify=False, cert='foobar',
+                    baseurl='http://dummy', timeout=5)
+    assert isinstance(req, Requester)
+    assert req.username == 'foo'
+    assert req.password == 'bar'
+    assert not req.ssl_verify
+    assert req.cert == 'foobar'
+    assert req.base_scheme == 'http', 'dummy'
+    assert req.timeout == 5
+
+
+def test_mix_two_unnamed_named_parameters():
+    req = Requester('foo', 'bar', ssl_verify=False, cert='foobar',
+                    baseurl='http://dummy', timeout=5)
+    assert isinstance(req, Requester)
+    assert req.username == 'foo'
+    assert req.password == 'bar'
+    assert not req.ssl_verify
+    assert req.cert == 'foobar'
+    assert req.base_scheme == 'http', 'dummy'
+    assert req.timeout == 5
+
+
+def test_mix_three_unnamed_named_parameters():
+    req = Requester('foo', 'bar', False, cert='foobar', baseurl='http://dummy',
+                    timeout=5)
+    assert isinstance(req, Requester)
+    assert req.username == 'foo'
+    assert req.password == 'bar'
+    assert not req.ssl_verify
+    assert req.cert == 'foobar'
+    assert req.base_scheme == 'http', 'dummy'
+    assert req.timeout == 5
+
+
+def test_mix_four_unnamed_named_parameters():
+    req = Requester('foo', 'bar', False, 'foobar', baseurl='http://dummy',
+                    timeout=5)
+    assert isinstance(req, Requester)
+    assert req.username == 'foo'
+    assert req.password == 'bar'
+    assert not req.ssl_verify
+    assert req.cert == 'foobar'
+    assert req.base_scheme == 'http', 'dummy'
+    assert req.timeout == 5
+
+
+def test_mix_five_unnamed_named_parameters():
+    req = Requester('foo', 'bar', False, 'foobar', 'http://dummy', timeout=5)
+    assert isinstance(req, Requester)
+    assert req.username == 'foo'
+    assert req.password == 'bar'
+    assert not req.ssl_verify
+    assert req.cert == 'foobar'
+    assert req.base_scheme == 'http', 'dummy'
+    assert req.timeout == 5
+
+
+def test_all_unnamed_parameters():
+    req = Requester('foo', 'bar', False, 'foobar', 'http://dummy', 5)
+    assert isinstance(req, Requester)
+    assert req.username == 'foo'
+    assert req.password == 'bar'
+    assert not req.ssl_verify
+    assert req.cert == 'foobar'
+    assert req.base_scheme == 'http', 'dummy'
+    assert req.timeout == 5
+
+
+def test_to_much_unnamed_parameters_raises_error():
+    with pytest.raises(Exception):
+        Requester('foo', 'bar', False, 'foobar', 'http://dummy', 5, 'test')
+
+
+def test_username_without_password_raises_error():
+    with pytest.raises(Exception):
+        Requester(username='foo')
+        Requester('foo')
+
+
+def test_password_without_username_raises_error():
+    with pytest.raises(AssertionError):
+        Requester(password='bar')
+
+
 def test_get_request_dict_auth():
     req = Requester('foo', 'bar')
 

Connection failed with crumb requester as 403 Client Error: Forbidden 
##### ISSUE TYPE
<!--- Pick one below and delete the rest: -->
 - Bug Report

##### Jenkinsapi VERSION
0.3.7
##### Jenkins VERSION
Jenkins ver. 2.150.1
##### SUMMARY
<!--- Explain the problem briefly -->
Looks like in the latest release the connection to a jenkins instance that has CSRF protection enabled is not working anymore.
For example by executing:
```
#!/usr/bin/env python3

from jenkinsapi.jenkins import Jenkins
from jenkinsapi.utils.crumb_requester import CrumbRequester

jenkins = Jenkins(
    'http://localhost:8080', username='test', password='test',
    requester=CrumbRequester(
        baseurl='http://localhost:8080',
        username='test',
        password='test'
    )
)

for job_name in jenkins.jobs:
    print (job_name)
```
##### EXPECTED RESULTS
<!--- What did you expect to happen when running the steps above? -->
Print all the jobs currently available on the jenkins instance.
In the previous version (0.3.6) the above code just worked fine.
##### ACTUAL RESULTS
<!--- What actually happened? If possible run with extra verbosity (-vvvv) -->
Getting 403 forbidden when instantiating a new Jenkins object.
The stacktrace is:
```
ERROR:root:Failed request at http://localhost:8080/api/python with params: {'tree': 'jobs[name,color,url]'} jobs[name,color,url]
Traceback (most recent call last):
  File "./test.py", line 11, in <module>
    password='test'
  File "/usr/local/lib/python3.6/dist-packages/jenkinsapi/jenkins.py", line 63, in __init__
    JenkinsBase.__init__(self, baseurl, poll=not lazy)
  File "/usr/local/lib/python3.6/dist-packages/jenkinsapi/jenkinsbase.py", line 35, in __init__
    self.poll()
  File "/usr/local/lib/python3.6/dist-packages/jenkinsapi/jenkinsbase.py", line 57, in poll
    data = self._poll(tree=tree)
  File "/usr/local/lib/python3.6/dist-packages/jenkinsapi/jenkins.py", line 68, in _poll
    if not tree else tree)
  File "/usr/local/lib/python3.6/dist-packages/jenkinsapi/jenkinsbase.py", line 81, in get_data
    response.raise_for_status()
  File "/usr/lib/python3/dist-packages/requests/models.py", line 935, in raise_for_status
    raise HTTPError(http_error_msg, response=self)
requests.exceptions.HTTPError: 403 Client Error: Forbidden for url: http://localhost:8080/api/python?tree=jobs%5Bname%2Ccolor%2Curl%5D
```
##### USEFUL INFORMATION
<!---
For bugs, show exactly how to reproduce the problem.
For new features, show how the feature would be used.
-->
Just run the code above using both 0.3.6 and 0.3.7 and compare output.
<!--- Paste example code and full stacktrace below -->

jenkinsapi_tests/unittests/test_requester.py::test_all_named_parameters jenkinsapi_tests/unittests/test_requester.py::test_mix_one_unnamed_named_parameters jenkinsapi_tests/unittests/test_requester.py::test_mix_three_unnamed_named_parameters jenkinsapi_tests/unittests/test_requester.py::test_mix_four_unnamed_named_parameters jenkinsapi_tests/unittests/test_requester.py::test_mix_five_unnamed_named_parameters jenkinsapi_tests/unittests/test_requester.py::test_all_unnamed_parameters jenkinsapi_tests/unittests/test_requester.py::test_password_without_username_raises_error
jenkinsapi_tests/unittests/test_requester.py::test_no_parameters_uses_default_values jenkinsapi_tests/unittests/test_requester.py::test_mix_two_unnamed_named_parameters jenkinsapi_tests/unittests/test_requester.py::test_to_much_unnamed_parameters_raises_error jenkinsapi_tests/unittests/test_requester.py::test_username_without_password_raises_error jenkinsapi_tests/unittests/test_requester.py::test_get_request_dict_auth jenkinsapi_tests/unittests/test_requester.py::test_get_request_dict_wrong_params jenkinsapi_tests/unittests/test_requester.py::test_get_request_dict_correct_params jenkinsapi_tests/unittests/test_requester.py::test_get_request_dict_wrong_headers jenkinsapi_tests/unittests/test_requester.py::test_get_request_dict_correct_headers jenkinsapi_tests/unittests/test_requester.py::test_get_request_dict_data_passed jenkinsapi_tests/unittests/test_requester.py::test_get_request_dict_data_not_passed jenkinsapi_tests/unittests/test_requester.py::test_get_url_get jenkinsapi_tests/unittests/test_requester.py::test_get_url_post jenkinsapi_tests/unittests/test_requester.py::test_post_xml_empty_xml jenkinsapi_tests/unittests/test_requester.py::test_post_xml_and_confirm_status_some_xml jenkinsapi_tests/unittests/test_requester.py::test_post_and_confirm_status_empty_data jenkinsapi_tests/unittests/test_requester.py::test_post_and_confirm_status_some_data jenkinsapi_tests/unittests/test_requester.py::test_post_and_confirm_status_bad_result jenkinsapi_tests/unittests/test_requester.py::test_get_and_confirm_status jenkinsapi_tests/unittests/test_requester.py::test_get_and_confirm_status_bad_result