Fixed #65: _sortResultsIfApplicable:returnType: is not optimal

- Also fixed the documentation.
Fixed #64: predicateWithColumn value of NULL not possible?

- Also fixed NSFNanoSearch
- Updated the documentation
Fixed #66: Make NanoPersonTestClass a subclass of NSFNanoObject

- Also made NanoCarTestClass and NanoPersonTestClass ARC-compliant.
Fixed #62: Add support for scoping search by bag

Merge branch 'master' of https://github.com/mrwanny/NanoStore into mrwanny-master
Fixed #67: Add tests to verify NSFNotEqualTo

- Also modified the string representation of NSFNotEqualTo.