Adding more extension tests to Djblets

Review Request #1725 — Created July 30, 2010 and submitted — Latest diff uploaded

Information

Djblets
extensions

Reviewers

This patch relies on http://reviews.reviewboard.org/r/1687/

Just added a few tests for the ExtensionManager and the Hooks.

A lot of the ExtensionManager methods aren't tested yet.  Things like the Manager calling syncdb are making things kind of difficult.
All tests pass.