angular-cli: Configure sass-loader to include node_modules in includePath
<p>angular-cli: 1.0.0-beta.15</p>

<p>node: 6.5.0</p>

<p>os: linux x64</p>

<p>I want to compile the scss file from <code>bootstrap-material-design</code> v4-dev branch by putting it in the apps[0].styles[] array of <code>angular-cli.json</code>  but I get the following error:</p>

<pre><code>ERROR in ./~/css-loader!./~/postcss-loader!./~/sass-loader!./~/bootstrap-material-design/scss/bootstrap-material-design.scss                                               
Module build failed:                                                                                                                                                       
@import "bootstrap/scss/variables"; // from bootstrap node_module                                                                                                          
^                                                                                                                                                                          
      File to import not found or unreadable: bootstrap/scss/variables                                                                                                     
Parent style sheet: /home/ciesielskico/Documents/Git/reports/node_modules/bootstrap-material-design/scss/_variables.scss                
      in /home/ciesielskico/Documents/Git/reports/node_modules/bootstrap-material-design/scss/_variables.scss (line 45, column 1)       
 @ ./~/bootstrap-material-design/scss/bootstrap-material-design.scss 4:14-148                                                                                              
 @ multi styles
</code></pre>

<p>angular-cli.json</p>

<pre><code>"styles": [
                "../node_modules/bootstrap/scss/bootstrap-flex.scss",
                "../node_modules/bootstrap-material-design/scss/bootstrap-material-design.scss",
]
</code></pre>

<p>On bootstrap-material-design's documentation it says to put node_modules in the includePath of the sass-loader.</p>

<p>Is it possible with the current version of angular-cli?
If yes, how?</p>