More cleanup
Store the classifier in the answer handler for each State. This removes the need for an extra call to the datastore to fetch the Widget, thus making the reader interactions faster.
Fix error in previous commit
Replace old 'actions' attribute in JS code with 'handlers'.
Remove use of 'attrs' from the interactive widgets
Shortening objects_test.py
Make classifiers into first-class objects.
Add file missed in previous commit.
Add more model tests.
Remove a stray comment
Add tests to the exploration, parameter and classifier models, bringing them to nearly 100% coverage.
Moving models/ to apps/ in preparation for the migration to django non-rel
Updating GAE to v1.7.7.
ported image model, added tests
added django specific files