.vim: Use Ctrl-P instead of Command-T

Ctrl-P is a full path fuzzy file, buffer, mru, tag finder for Vim.
It is written in pure Vimscript, as opposed to Command-T which needs
Vim to be compiled with Ruby support.
.vim/bundle: Update vim bundle submodules
.vimrc: Tweak StatusLine highlighting

* Update StatusLine to have buffer # (%n) in ctermfg=DarkGreen.
* Use Solarized colors for guifg/guibg.
.vimrc: Add DiffToggle()

Taken from: http://www.bestofvim.com/tip/diff-diff/