Fix for the ErrorDialog.

Turns out the imporved  error dialog was less helpful than the old one...
Merge pull request #124 from kwando/fix_better_error_dialog

Fix for the ErrorDialog.
fix race in TestAwtPanels as discussed at http://hub.jmonkeyengine.org/forum/topic/fix-for-race-in-testawtpanels
use maven repo version of j-ogg and j-vorbisd
clean up some naming in SDK build.gradle
- update JmeVersion automatically in build script
- change handling of version "tag" (stable, svn etc.)
Bugfix: fix that allows to use either quaternion or euler rotation in
bone animation.