Add tests for special NSDate singleton-ness.
A few tests for NSBlockOperation block accessors
Test for -[NSLocale displayNameForKey:value:]; https://code.google.com/p/apportable/issues/detail?id=310
Slightly more stressful NSMutableIndexSet test
Merge branch 'master' of github.com:apportable/FoundationTests
Add tests for NSArray KVO.
Add tests for exceptions thrown by KVO with NSSet and NSOrderedSet.
Merge branch 'apportable/master'