Implement private header
Add note about private headers
Update source files for podspec
Sterner commetn warning
More robust data type inference
Add NSSet to data types
Add other object data type
Expose nil invocation method in private header
Add support for extra inline mappings
Revert podspec not to specify tag, pending merge
Merge branch 'master' into develop

Conflicts:
	RZAutoImport.podspec
Rename mappings method for consistency
Use serial queue instead of mutex - no need for reentrancy
Minor optimization for non-mutable mappings dict
Correct cast when getting from cache
Less mutable state, more efficient override
Cache performance boost
Rename test project
Full class/method/type rename
Update README