Adds pathogen for vim.

Installs as a git submodule so that it can be updated the same way as
the other bundles.
Adds vim colorscheme 'jellybeans'.
Adds some custom leader mappings to vimrc.

Adds the grep-operator plugin from
http://learnvimscriptthehardway.stevelosh.com/chapters/34.html.
Adds quickfix toggle mapping for vim.