Removing .DS_Stores
Better equals and hashcode in Coord3d

Since the class is mutable and exposes its fields publicly, we cannot cache the hashCode!
Adding equals and hashCode methods to BoundingBox3d
BugFix: Initialization does not reset manual bounds (if already set)
Enhancement: creating a bridge in the given composite (without creating an inner embedded composite)
Merge pull request #31 from ichrome/master

Some cleanups & small fixes