Several changes to vimrc's plugins

I've tried to migrate over all submodules but I removed some of them.

Removed:
* Hammer ( I don't think we use this )
* Statline ( Deprecated in favor of powerline )
* Matchit (Already included in Vim )
* Cucumber ( I don't think we use it )

Changed:
* zencoding changed it's name to emet

Added:
* LustyJuggler and LustyExplorer - LustyJuggler is a really easy way of
  switching between buffers. LustyExplorer is a nice alternative to
  ctrlp
* LargeFile - It sets defaults to handle really large files > 100 mb, it
  disables highlighting, and other type of slow performing options.
* Syntastic - It checks your syntax and it can tell you if you have any
  :Errors
* IndentGuides - Nice way to color indentation.
* Ultisnips and ultisnips-snippets - Really useful dynamic snippets that
  are really easy to use
* Tabular - Easily organize and align your vertical lists and data
* Autotag - Automatically regenerates your tags file in a given
  directory.
* vim-powerline - Deprecated (but still useful) version of powerline for
  vim
* Supertab - easily autocomplete
Add new settings and document them