Added the ability for ships to respawn.

This logic requires a new player spawner object. In addition, the logic
takes place in bullet hit, but should really take place in a respawn
class of its own. Change this later.
Reverted mineBehavior
Merge branch 'master' of https://github.com/jceipek/ionian-eclipse

Conflicts:
	Assets/Scripts/BulletHit.cs