Add gitconfig
Add a bunch of git scripts (taken from @holman)
Remove excess undo alias from gitconfig
Add Boris and PHPMD to composer

Boris is a cool little PHP REPL that, using Unix forking, "ignores"
fatal exceptions that usually cause `php -a` to quit.

The PHP mess detector is a useful utility to find typical code smells in
PHP source.
Add powerline and tmux packages to vimrc.bundles
Update color scheme settings to work with iTerm2

It seems like iTerm2 themes and vim themes don't normally play nicely
together, but these settings seem to get them to at least pretend they
don't mind each other.

Mostly.

It also means that the vim-airline plugin (powerline) is readable, which
it wasn't before. So that's good.