Fix some plugin problems and update PHP bundles

There was an issue with tpope's bundler, so this removes that. It also
adds a bunch of cool plugins, including colors, editorconfig (super
important), a local rc plugin, gitgutter, and NERD-commenter.
Cleanup vimrc and add a new training wheel

Training wheels are things that make me do the things I'm supposed to be
doing, like navigating from the home row instead of the arrow keys. This
particular one, taken directly from Steve Losh's "Learn Vim Script The
Hard Way" repo / book, removes the escape key's functionality and
replaces it with "jk".

This is very effectively teaching me to use my new binding. I'll
probably remove it once I've trained my brain, but until then it stays
in.