remove height-translation of water
remove unnecessary notifiy-functions. #85
change ParticleGroupObservers to unordered_set. #85
Merge pull request #95 from lanice/rework_physicsWrapper_particles_85

Rework physics wrapper particles 85
fix capitalization and things like that
Merge branch 'water_rendering_30' into terrainToParticles_57
Merge remote-tracking branch 'origin/master' into terrainToParticles_57
remove gpu/physx  not available warnings for internal functions