Moved classes to the right path to match with the group
KVO Keys moved to let
Removed Tuples
[WIP] Few tweaks in the SugarRecord class
Reviewed NSPersistentStore+Stack
Styling, code formatter
Merged from Master, unit tests passed
Clean up and unit tests added
Restore background class method for save operation
Merge pull request #4 from fjbelchi/SugarRecord-Class

Sugar record class