(#129)

issue #126 and #129 is solved in one branch. 
Not all issues are solved from #126.
They are open:
Motion:
Point towards: Nothing… 

Looks:
Switch look to Nothing…  New: Name of the first look of the sprite if it exists; if the sprite has no look yet, switch to Looks activity and open the interaction as if the user had pressed on "+" to add a look.  (the first part is the same as with Scratch; the second part is very meaningful from a user interaction point of view and has already been discussed with the usability team; AFAIK it is planned for a future version)

Sounds:
Start sound Nothing…  New: First sound of the sprite if it exists; if the sprite has no sound yet, switch to Sounds activity and open the interaction as if the user had pressed on "+" to add a sound.  (the first part is the same as in Scratch; the second part is very meaningful from a user interaction point of view and has already been discussed with the usability team; AFAIK it is planned for a future version) 

Control:
When I receive Nothing…  New: "message 1"  (same as in Scratch 2.0 (not in 1.4); messages that are not used in any "When I receive" brick are deleted when saving the program in Scratch --- we could consider doing something similar, but this would need to be thought through as the way we save a program is very different in Catroid; this string should be language specific, e.g., in German it should be "Nachricht 1" etc.)
Broadcast Nothing…  New: "message 1"  (same as above)
Broadcast and wait Nothing…  New: "message 1"  (same as above)

NXT:
NXT turn motor A (user sees a meaningful example)
NXT stop motor A  (user sees a meaningful example)
NXT move motor A  (user sees a meaningful example)

Testrun: http://catrobatgw.ist.tugraz.at:8080/job/Catroid-custom-branch-test/412/