Fixed #58: Make the classes description method to output a JSON string
Merge pull request #59 from mrwanny/master

Use only keyed Archive
Forgot to restore the store path.
Updated the documentation.
Fixed #14: NSURL Support?
Fixed #61: Add a method to make non-JSON types safe.
Fixed #60: New NSFOrderedDictionary.h makes the project fails on iOS
Fixed #33: Add save support in NSFNanoObject
Fixed #50: Bring NanoStore closer to Obj-C 2.0 specs and best practices