Add Bitdeli badge
Use `performBlockAndWait:` to avoid duplicates when adding to the cache. refs #1079
Fix crash in tests due to fetch request cache changes
Fix intermittent test failures/crashes
Improve performance of cache key calculations by using fast enumeration and avoiding `[NSString stringWithFormat:]`
Fix exceptions in OS X test suite
Remove unnecessary logging from test
Merge branch 'development' into JiffBranch