Only enable admin button on main page if logged in.  Always redirect to main page when user logs out.
Changed so any logged in user can create/edit questions.  GAE admins can modify all questions.
Added question id to question list on admin page
Bug Fix: was returning Cluster not ClusterTag object
Nickname authentication support added to questions. **Not tested**

* Nickname stored in session
* Reverted back to gaesessions for sessions (webapp2 version not
working as expected)
* Need to test