Hacklace2 Snap-On Case

This is my second version of a simple snap-on case for the [Hacklace2](http://wiki.fab4u.de/wiki/Hacklace/en). It is smaller then the previous version (half the height), and it comes with rounded corners. There are different versions available:

* Breakout for both headers (programming and extension)
* Breakout only for the programming header
* Not header breakouts at all