Added play music node
Merge remote-tracking branch 'upstream/develop' into behavior
fixed miglayout and added @API to WorldAtlas
fixed music and sound node
added a global entity to run music node
Merge remote-tracking branch 'upstream/develop' into behavior
Only one global entity can be exist
Added AudioEndListener, so PlaySound/Music nodes switch from RUNNING to SUCCESS, once the sound/music ends.
Updated description in prefab
Merge remote-tracking branch 'upstream/develop' into behavior

Conflicts:
	engine/src/main/java/org/terasology/logic/behavior/BehaviorSystem.java
fixed bug in PostBeginSystems
AutoCreate to create a global entity for the default behavior tree
Removed API from WorldAtlas
ZoomableLayout can now zoom
Merge remote-tracking branch 'upstream/develop' into behavior
AudioEndListeners are now registered per sound/music play
removed log message
Fixed ConfigWorldGenScreen

The displayed properties are now correctly updated on selection change
events.
log missing modules at error level
initial mesh Collada support
polylist triangle support
push eaxy library
Merge remote-tracking branch 'origin/collada-support' into PR-collada-support