add 'coding' declaration into .py files

remove find operator from model to model manager
add urls file in codes module
clean views.py in codes module

небольшая приборка в коде,
пофикшена бага:
  File "phonecodes/codes/tests.py", line 65, in test_get_operator_fail
    self.assertEqual(json_resp['status'], 1)
AssertionError: 0 != 1