Updated Acid Cloud Behaviour

Acid clouds eat stray ions, no code yet for neutralization.
Occasional null pointer exception during gameplay, unknown cause atm.
MediumParticle: set the charges based on parameter passes.
Merge branch 'master' of https://github.com/itschusa/Elemental-Shoot-Out

Conflicts:
	MediumGame.java
	MediumParticle.java