- fixed setNumParticle method to correctly update the mesh buffers
- added a getMaxNumParticle that returns the max number of particles of the emitter
- changed testMovingParticles and testPointSprite to change the numParticle when hitting the space bar
git-svn-id: https://jmonkeyengine.googlecode.com/svn/trunk@7939 75d07b2b-3a1a-0410-a2c5-0572b91ccdca