title: vimrc test for if_lua during vundle BundleInstall
body: <p>I use the same .vimrc file on lots of systems.  I'd like to bypass vundle installing some modules that I know won't work if 'if_lua' is not present.</p>
  
  <p>Is there a vim script way of conditionally doing</p>
  
  <pre><code>Bundle 'Shougo/neocomplete.vim'
  </code></pre>
  
  <p>only if vim was compiled with lua to avoid the start up error:</p>
  
  <pre><code>$ vim myprogram.c
  neocomplete does not work this version of Vim.
  It requires Vim 7.3.885 or above and "if_lua" enabled Vim.
  Press ENTER or type command to continue
  </code></pre>
  
  <p>thx</p>