minor cleanup and enforcement of coding standards
Changing meaning of "elasticy" in applyHardCollision() to range in [0,1] instead of [1,2]

Also enforcing C++ style casts as per coding standard.
Merge remote-tracking branch 'trunk/master'
minor formatting and code standard enforcement to Particle.*
exposed getVelocity() and findSpherePenetration() in Avatar base class
Particles now collide with avatars, but avatars don't react yet.
Merge pull request 1435 into https://github.com/worklist/hifi 'master'

Conflicts:
	libraries/particles/src/ParticleCollisionSystem.cpp