Implementations in Model, ActiveRelation, Core

Created:
	Joker.ActiveRelation

Implementations:
	Joker.Model
		- Created the simple methods: has_attribute, has_association, id, to_json, to_object
		- Created the static methods: all, from_json, primary_key
		- Renamed methods: serializer to from_form
	Joker.Core
		- Created static methods: attr_accesor

BugFix:
	Joker.Ajax
		- When the request is finished, the object shall be excluded in order to free memory space
	Joker.Core
		- Modified the attribute "id"  to "object_id "