Delete minibufexpl.

It turns out minibufexpl was preventing tagbar from returning to the
last window accessed. This and the windows always resizing to be equal
has lead me to decide to no longer use this plugin.
Add FuzzyFinder and comments in vimrc.

I'm using FuzzyFinder to replace minibufexpl and it's also worked out
well as a quick way to jump to tags and open files. Added keybindings
for FuzzyFinder's commands. Mapped my leader key to the spacebar.
Fleshed out some more of the comments in vimrc. Turned off equalsalways.