Move `rb-version` to its own file.
Fix comment.
Move `mkcd` to its own file.
Remove VimClojure.

I'm going to use VimClojureStatic and fireplace.
Add VimClojureStatic.
Add rainbow_parentheses.
Add vim-fireplace.
Add vim-classpath.
Add mappings for vim-fireplace.
Move `mkcd` to bash/functions.

This is required because to change the directory correctly it has to be
in the same process. By using a standalone function it'll change the
directory in the new spawned process and not where you actually called
it.