Big changes: you can now move bubbles regardless of whether the bubble is in equilibrium. Also properly set up Underscore as a static library, so it is usable now.
Put in the beginnings of resolving collisions: KryptoPhysics now detects collisions, and applies a resolving force on any masses that cross into another bubble's body. The direction of the force is currently from the mass to the mass opposite it on the other side, but it will ideally be radially inward toward the centroid. The magnitude of the force is currently hard coded at 100, but will ideally depend on the velocities and masses of the bubbles in question. As such, the bubbles just destory each other when they collide, but its really awesome to watch.