NERDTree show hidden files.

NERDTree show hidden files from now
Many changes!

* git now with git grep options
* tint2 does not autohide and only showed in a single panel
* vim has :noh with double <CR> that cleans the searchs
* xmonad does not restore nitrogen at begin
Merge branch 'master' of github.com:jdevesa/dotfiles
Add vim-virtualenv plugin

Add virtualenv plugin to see in which virtual environment we are working
in the vim-airline plugin.
Trick to handle fugitive buffers.

Avoid saving buffers created by fugitive plugins.
Add options just for RST filetype.

Adding textwidth=80 and auto-wrapping in RST texts
Add spell check in English for RSTs docs.

Write well is a must!
Clone vim-virtualenv in the proper directory.