Workaround for Travis

Travis doesn't support cpu affinity in their virtuals so I've added a setting TESTING that will bypass the actual affinity setting, but will still cover most of the code.
Might be useful for future workarounds.

django_q/tests/settings.py

@@ -103,4 +103,5 @@ STATIC_URL = '/static/'
 
 # Django Q specific
 Q_CLUSTER = {'name': 'django_q_test',
-             'cpu_affinity': 0}
+             'cpu_affinity': 1,
+             'testing': True}