lanice/elemate — pull request #95 by lanice (2014-01-25 14:17:08+00:00)
Title: Rework physics wrapper particles 85

* A ParticleGroup holds a single type and group of particles, e.g. a water spring.
* You can create ParticleGroups via the ParticleScriptAccess (see example in Manipulator).
* ParticleGroups are registered to World as observers to do the updating (visuals and creation when emitting) if necessary.