Replaced vim_bundles with "stupid vim plugin installer".

vim_bundles required the vim-bundler ruby gem, which was a pain everytime I went
to bootstrap a new install, or sat next to someone as they tried to install my
dotfiles.

"Oh, now you need to install the vim plugins... let's see... gem install
vim_bundler?"

"nope, no gem"

"gem instlal vim-bundler"

"bingo"

"Ok, now... vim-bundle install?"

"nope"

"vundle install?"

"negatory"

"Oh man... what was it... OH! vbundle install!"

"ok, some sort of error"

"oh, you need ruby 1.9.3... ok, switch rubies and reinstall the gem..."

Aaaaand so on.  What a pain.  And for what?  Just to manage the cloning of a
list of repos?  Pfft.  I just want a stupid vim plugin installer that works with
pathogen.