Updated tests to take into account last 2 commits
Updated tests to take into account last 2 commits

 - Using "success" instead of "ok" as status
 - Checking that the xhr argument given to callbacks is the same object as the one returned by the ajax function instead of checking that it is an instasnce of XHR
 - Added a test to check that the .done() method works even after the call has been ended (ie when the "done" flag is true)

jacomyal/djax,jacomyal/djax