@gvaish Removed reference to JSONObject - a massacre

* pom.xml: Commented reference to org.json/json
* ModelBase: Renamed to Model, encapsulates ErrorInfo and Item
* Item: New base class for all models
* model/*: Inherit from Item
* IsArray: For 'array' items
* JSONTransformerFuture: Deleted
* TypeTransfomerFuture: T extends Item
* ErrorInfo: Commented static-get method
* Facebook: Commented methods working with JSONObject - nothing left as of now