Fix getCenter(out)

Fix public Vector3 getCenter (Vector3 out) to actually update the out parameter
change robovm version note

build.gradle as output by gdx-setup uses 1.0.0-alpha-04 in libgdx 1.4.1
Unfixed until it can be seen a problem exists.

#2437
fixing BoundingBox mul

multiplication on bounding box must be set to inf() before using ext().
because a transformation like a translation is not an extension of the bounding box, so ext() is not valid in this case.
boundingbox must be reset with inf() first.
Update Music.java

Update OpenALMusic.java

Update AndroidMusic.java

Update MockMusic.java

Update IOSMusic.java

Update GwtMusic.java

Update IOSMusic.java