Redid the migrations to make sure all are reversable.
Added URL to 'Register Now' link button on home page.
Modified referer column of url_hits database table to NOT NULL.
Displays clicks received on shortened links on home page to logged-in user.

Renamed users_urls database table to url_user to make data retrieval
across intermediate table easier.
Added relationship information to classes.
Fully identified the built-in URL class on the master layout to prevent
it interfering with Bernly's Url model.