* Add/change appledoc section headers to be consistent.
* Reorganize methods and properties to fit under their respective sections.
* Fill in missing parameter definitions and return values.
* Fix documentation formatting, styling, and placement.
* Clean up asterisk placements in variable declarations.
* Removed RestKit from inheritance hierarchy
* Mappings are implemented as concrete classes
* Mapper is much more flexible & powerful
* Much more robust error handling
* Serialization is reimplemented as an object mapping operation
* Added ability to serialize to JSON natively
* Reworked Core Data integration
* Simplified the codebase substantially