* Added test that demonstrates above functionality, by starting Application without attaching the canvas, and then constantly attaching and detaching canvas from a frame.
* Deleted deprecated methods in JmeContext
* Deleted deprecated class LwjglJoyInput
* Audio renderer will not attempt to initialize OpenAL twice if already initialized
git-svn-id: https://jmonkeyengine.googlecode.com/svn/trunk@7078 75d07b2b-3a1a-0410-a2c5-0572b91ccdca