make tests: use  --liveserver=127.0.0.1 instead of localhost (proxy...).
settings.py: SILENCED_SYSTEM_CHECKS (test_runner).
Fix TO_FIELD_VAR that was hardcoded and had changed.
Switch to StaticLiveServerCase when testing under Django >= 1.7 since LiveServerTestCase does not serve static any more.
Add exclude attr in ModelForm (DeprecationWarning.)
pffff...
Bump to 0.94 for Django-1.7 compatibility.