Redirect legacy college links

Such as "ncsu", "ecu", etc.

Add "short_name" method to handle these as 301 redirect.
Remove ids from seeds for Colleges
Add "legacy_url" to communities table
Move legacy_redirect method into application controller

* Move "short_name" out of colleges controller
301 redirect legacy college and community links

Boom!  3 lines, basically one!
Seeded NCSU Communities
Switching order in listings header