Refactored Object/Record level.

Object/Record logic moved out from openerp_proxy.core module.
Implemented extension system for Objects and recrods.
Extra functionality such as workflow and record relations implemented
using this extension system.
So now to add some functionality to Object objects just create
class inherited from openerp_proxy.orm.object.ObjectBase, and that
functionality will be available on all Objects. Same applied for records
too. For more info - see code in openerp_proxy.orm package.