Assembla v1 api

* Integrating ZF 2.0 modules into autoloading scheme
* refactoring Core_API __call function to use ZF2.0 modules
** Introduces a service object to represent the json services
** service objects return objects that descend from Zend\Http\Request
** Introduces Client objects that mange the request -> response transformation
** Response objects now descent from Zend\Http\Response objects
** Response objects now have a function getObject() which manage json/xml content to PHP object conversion
* refactors tests to come into line with the above changes
** introduces an example test of the Assembla API __call functionality that inherits from the Core_API object (using Zend\Http\Adapters\Test)
** tests pass,  though there are serveral unimplemented tests