This controller makes sure that only the current view
receives its notifications. Therefore we won't do any work that we don't
see, like parsing diffs or asking for trees. This makes everything quicker.
This makes the initial startup much faster. Commits get loaded in a separate
thread, and are displayed every 1000 commits.
There is a bug in here that makes fails a click while it is loading the commit
list. Not sure how to fix this, perhaps send the arrayController?
Pieter de Bie