Unity 2D Oneiric Improvements

The goal of this blueprint is to list and discuss all the improvements we’d like to see land in unity-2d during the Oneiric cycle.
In its current state, it is *not* a list of things we commit to doing, rather a basis for discussion.

Here is a first list, feel free to add to it or to break some of its items down into more specific tasks:

- fill in the gap between unity and unity-2d (https://bugs.launchpad.net/unity-2d/+bugs?field.tag=delta-with-3d)
- share settings with unity 3d (bug #692965)
- rewrite bamf-qt to use libbamf instead of relying on the D-Bus API
- minimize gtk dependencies
- remove X dependencies
- document thoroughly the code base
- add more unit tests