0..size iterates through size + 1 elements. So asking for an API
that was 16 was actually returning a string of 17 characters. This
broke trying to shove it into a varchar(16) in PostgreSQL.
Simplify channels & user controllers and models, moving code to the models.
Remove catch-all route and ensure all actions are specified, fixing url paths.
Change clone to dup in feed_controller as using clone seems to affect the cloned object (problem only in ruby 1.9.3?)
