Append page name to commit message

_User story 1:_ Most of the time, I don't bother to write a change description. If I look at the repository log (e.g. with `gitk`) I see the default description and nothing else. It's hard to find a particular edit for one page.

_User story 2:_ I write meaningful change descriptions. Because I have lots of pages dealing with similar topics, I routinely add the page name for clarity. This feels redundant, and it clutters up page history.

In both situations, automatically adding the page name (in parentheses?) to the commit message helps. It should probably be filtered away for the page history.