Adds a benchmark test

This adds a file to the Test target that benchmarks each operation.
Improve performance of Array operations

This diff just includes a few small performance tweaks.
Improve performance of Dictionary operations

A few more small performance tweaks...
Improve performance of Set operations

Similar small perf tweaks as for Array...
I'm apparently an idiot who can't resolve a merge conflict correctly...
... *sigh*
Silly...those go in the other pull request!
...cache invalidation, off-by-one-errors, and...somethingsomething
Remove copyright notices in headers
Return new object for concurrent mutation tests

This ensures that proper ARC semantics and ownership is being applied.
ARC is magic!
Now with OrderedSet speed enhancements as well!
Merge pull request #5 from jballanc/speed-improvements

Conflicts:
	ConcurrentCollectionOperations/NSArray+ConcurrentCollectionOperations.m
	ConcurrentCollectionOperations/NSDictionary+ConcurrentCollectionOperations.m
	ConcurrentCollectionOperations/NSSet+ConcurrentCollectionOperations.m
Fix memory leak black hole

I was always suspicious of the way I cargo cult sprinkled __strong and
__unsafe_unretained casts to handle memory management, but Xcode and
Instruments acted like everything was dandy and that there were no leaks.
Finally, I had reason to figure it out properly, which resulted in this commit.

As @jballanc pointed out, ARC actually hampers this kind of low level code, but
this code uses the __bridge* escape hatches to force retains and releases as
necessary. I stayed with ARC because at this point, it's a hassle to be
non-ARC. If ARC gets to be too much of a hassle, we can switch to MRR or
whatever Apple calls the pre-ARC system.

This code:

    (__bridge id)CFBridgingRetain(x)

is a retain.

Likewise:

    CFBridgingRelease((__bridge CFTypeRef)x)

is a release.
Adds a benchmark test

This adds a file to the Test target that benchmarks each operation.
Add benchmark tests to project
Switch away from ARC to manual retain/release
Version v0.1.0
Perform releases asynchronously in map methods
Status update README