Add Airline Support

This requires a patched font, I was able to get this working using the
patched "Monaco for Powerline" font that is available here:
https://gist.github.com/baopham/1838072 . This is the patched version of
the default iTerm font. The additional variables set in vimrc is
necessary for airline to enable the powerline symbols.
Add support for the "z" command

This requires "z" to be installed with homebrew. `brew install z` will
do the job.
Add Vim-Seek Plugin

This lets you seek across a line using a 2 character index, in lieu of
the "f" command's one character index. It's occasionally faster than
using the "f", ";", "," triad to move within a line.
Add auto-fmting for golang files

This requires the ftplugins for golang to be linked into
~/.vim/ftplugin .
Add tmux.conf