FIx test for TagAlias.
Modernise query.
Cleanup test for Post.
Put back relevant fixtures.
Sleep to allow cache's timestamp to follow.
equal, not match. Herp.
delete, not destroy.

Though technically speaking there's problem found with destroy where
parent/children status isn't properly updated.
Move out anonymous user to its own class.

--HG--
rename : app/controllers/application_controller.rb => app/models/anonymous_user.rb
@current_user.id because otherwise AR becomes confused by AnonymousUser.

E.g. TagAlias.where(:creator_id => AnonymousUser.new)