reduce elasticity to be less than 1
Merge branch 'elasticity' of https://github.com/PhilipRosedale/hifi into elasticity-fix

Conflicts:
	libraries/particles/src/ParticleCollisionSystem.cpp
Minor cast enforcement during initialization.
Fixing build: missed some instances of VOXEL_ELASTICITY.

Also enforcing C++ style casts.
two script example files