Fix copyright survey random query (Rails 2/3)

Rails 3 uses ActiveRecord::Relation, which doesn't have a public rand
method. This alternative works on both Rails 2 and 3.

Also, simplify routes file.
Merge pull request #175 from va7map/feature-copyright-survey-fix

Fix copyright survey random query + simplify routes (Rails 2/3)
Merge branch 'edge' into sfu-develop