Add completion and set an environment variable for the containing directory.
Add hook callers for login and logout.

  Currently, I have hooks for shell:login and shell:logout actions
that a Ruby one-liner sends off to Keen.IO.  These things could be changed
to, for example, fire off a web hook.  Food for thought.
Add a ZSH profile that sources the main user profile.
Add RVM to PATH for scripting.