Refactor vimrc for use with Janus.
Rename for Janus: .vimrc becomes .vimrc.after.
Set git editor config.
Clean up gitconfig file.
Use portable path in gitconfig for excludes file.
Use awesome PS1 in Linux, too, but take Drush current-site status out.
Add .vimrc.before file to set leader key.
Add Janus's bootstrap script.
Remove now-redundant plugins in vim folder; rename vim folder so Janus will use what's in it.
Add git submodules for vim plugins.
Remove old Vim plugin files, add vim-cucumber (syntax highlighting) to replace cucumber.vim.