Break out separate Brewfile and aliases

Trigger Brewfile by running "brew bundle"
Also added YouCompleteMe and syntastic vim plugins
Given up with YCM/UltiSnips

After much struggling, can't get UltiSnips and YCM to behave properly
(share the tab key).
https://github.com/Valloric/YouCompleteMe/issues/36#issuecomment-15451411
didn't help.
Not having ctrl-tab or alt-anything available in OS X / iTerm is really
frustrating
UltiSnips and YCM sharing tab key