Add script-only VIM plugin installer

installs script to its own dir in ~/.vim/scripts, does nothing
to auto-load it
Restore closetag.vim as a script; autoload it for HTML/XML
Tweak Pathogen invocation
Remove clostag.vim
Add vim-coffee-script plugin
Standarfize autocmd invocation
Add UltiSnips Vim plugin; Add test buster.js snippets
Add .scss/.sass files to Ack's types
Vim should treat html.erb as html AND eruby, not just eruby
Make the TDD \t stuff Buster JS aware enough to be useful
Update existing Buster snippets to use VISUAL, add expect().toBe() snippet