Converting to ARC

Hello 2011!
Property cleanup
Removing another weak
__block self -> __weak self
Adding __strong references inside blocks
Dealing with self in nested blocks

Please tell me there is a better way.
Releasing zincRepo in test cases

Useful to see if anything is leaking when running under the profiler.
Removing another unneeded weak
More copy attributes and property cleanups
Removing one more unneeded weak
ZincRepoBundleManager using ARC now too
Removing -f-no-objc-arc flag
Merge pull request #75 from mindsnacks/feature/arc

Converting to ARC