add response test and rename tests

Author: tsolakoua

specs/client/response_spec.py

@@ -0,0 +1,11 @@
+import mock
+from amadeus import Response
+
+
+def test_response_init():
+    http_response = mock.MagicMock()
+    request = mock.MagicMock()
+    response = Response(http_response, request)
+
+    assert response.http_response == http_response
+    assert response.request == request