Update bringItOn button to notify WhyVille of success

Bring It On button now hits a new state action which notifies the
WhyVille controller and then sends the browser to the WhyVille
challenge book.
Go to next available activity when Bring It On is clicked

This should follow the currently-working pattern that is used
when a student clicks the "go to next activity" dialog in other
activities.

However, it is not easy to test the WV code locally, so there
may be unresolved issues with this commit.