The talk overlay must subscribe to the creation of new topics
so that the list of topics in the talk overlay contains the
newly created topic. It does this by subscribing to the
talk-discussion-added event and forcing a route refresh when that
has completed.
Additional changes to browser tests:
1) QA: CSS selector changed for talk overlay
Since I42fd7b08c4b9d92dee549d06de8a0012ea037d28 the '.add' class
was removed from the talk button. This makes the browser test fail
but is a false positive.
2) One of the browser tests was using the same selector to mean
two different elements - the add discussion button in the talk overlay
is now clearly distinguish from the "add discussion" button that is blue
and appears at the bottom of talk pages
Change-Id: I935b3c5f37baf242c06585ae0e2f13d059b9c324
7fd843cd89