Fix the DiffCommitIndexView to no longer use hoverIntent

Review Request #7652 — Created Sept. 20, 2015 and submitted — Latest diff uploaded

Information

Review Board
dvcs

Reviewers

The hoverIntent jQuery plugin was removed as a dependency on the
release-2.5.x branch and that change was eventually merged into the
dvcs branch. However, the DiffCommitIndexView utilized this plugin.
The view has been reworked to no longer depend on it and a bit of
cleanup has occurred.

Verified that the summaries expanded in the diff viewer.