some vim airline themes doesn't work
<p>I installed the <a href="https://i.stack.imgur.com/8tLOu.png" rel="nofollow noreferrer">vim-airlines</a> and its themes with <code>Vundle</code>. I changed my <code>.vimrc</code> to the following format: </p>

<pre><code>set nocompatible              " be iMproved, required
filetype off                  " required

" set the runtime path to include Vundle and initialize
set rtp+=~/.vim/bundle/Vundle.vim
" call vundle#begin()
" alternatively, pass a path where Vundle should install plugins
call vundle#begin('~/.vim/vundle_plugins')

" let Vundle manage Vundle, required
Plugin 'VundleVim/Vundle.vim'

" vim js plugin
Plugin 'pangloss/vim-javascript'

" auto complete
Plugin 'valloric/youcompleteme'

" file explorer
Plugin 'kien/ctrlp.vim'

Plugin 'tpope/vim-surround'

Plugin 'tpope/vim-fugitive'

Plugin 'bling/vim-airline'
Plugin 'vim-airline/vim-airline-themes'
" Plugin 'vim-airline/vim-airline'

" 
call vundle#end()            " required

" nmap &lt;F8&gt; :TagbarToggle&lt;CR&gt;
let g:airline_theme= 'wombat'
if !exists('g:airline_symbols')
    let g:airline_symbols = {}
endif

" unicode symbols
let g:airline_left_sep = '»'
let g:airline_left_sep = '▶'
let g:airline_right_sep = '«'
let g:airline_right_sep = '◀'
let g:airline_symbols.linenr = '␊'
let g:airline_symbols.linenr = '␤'
let g:airline_symbols.linenr = '¶'
let g:airline_symbols.branch = '⎇'
let g:airline_symbols.paste = 'ρ'
let g:airline_symbols.paste = 'Þ'
let g:airline_symbols.paste = '∥'
let g:airline_symbols.whitespace = 'Ξ'
set laststatus=2
"set background=light

filetype plugin indent on    " required
</code></pre>

<p>but nothing happens. I mean the following picture:</p>

<p><a href="https://i.stack.imgur.com/8tLOu.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/8tLOu.png" alt="My terminal pic"></a></p>

<p>There is no theme change even after quitting the vim and reopening it. I installed both 'vim-airline' and <code>vim-airline-theme</code> today. So they are up to date. </p>

<p>Any comments is appreciated.</p>

<p><strong>Update</strong></p>

<ul>
<li>I'm using 64bit Linux Mint 17</li>
<li>Vim version 7.4</li>
</ul>