Release Djblets 0.7.13.
Fix a bug with the new requests code.
Fix another case of calling super() on logging.Formatter.

Older versions of Python don't support this, so fall back to old-style
parent method invocation.
Fix a couple issues with events when submitting an inlineEditor.

When submitting an inlineEditor that has not changed, the caller is left
with either no idea that the editor was ever closed, or with misleading
data, which can mess with things like edit counts.

There are two cases where this occurs.

The first case is the standard case where nothing is changed and the
field is submitted. There's no callback that occurs letting the caller
know that anything happened. We now reuse the cancel callback for this.

The second case is when notifyUnchangedCompletion is true. The caller
will get notified of the "completion" callback, and is passed the new
value and the initial value. These will be the same when nothing has
changed. However, even if something has changed, the initial value is still
pointing to the new value, due to pulling from a bad variable when
triggering this event.

Both cases have been fixed.
Fix our $.fn.html wrapper to work with empty strings.

We had a long-standing bug it turns out where passing "" to html() would
result in the original html being called with undefined as the
parameter, causing it to return the result rather than set it. This was
due to how we were both calling the old function and the way in which we
were deciding what to pass to it. Now we just use call() and pass the
parameters.
Another attempt at fixing $.fn.html()

The previous attempt resulted in a strange problem where simply calling
html() would return a jQuery element. While I'm not sure how this could
happen, switching back to using apply and just being careful to check
against undefined fixes all the cases.
Split out gravatar methods a bit.

This allows us to get gravatar URLs both by User object and by email address.

Testing done:
Used in conjunction with some other changes.

Reviewed at http://reviews.reviewboard.org/r/4108/