Use email console backend in dev settings

Credit to @vindarel for original feature request on bottle version :
https://github.com/JocelynDelalande/wifi-with-me/pull/27

wifiwithme/settings/dev.py

@@ -10,3 +10,4 @@ try:
 except ImportError:
     pass
 
+EMAIL_BACKEND = 'django.core.mail.backends.console.EmailBackend'