Added NamingController

There is a small risk associated with this release since URLs like:

http://mushroomobserver.org/observer/edit_naming/243210

have turned into:

http://mushroomobserver.org/naming/edit/243210

However, these URLs are only accessible to logged in users and there is no explicit 'show_naming' URL.

It should be easy to address this issue if it shows up in the routes.rb file, but since I think it's unnecessary I'm going to release it as it current is and monitor for real world failures.