return headers
Merge remote-tracking branch 'origin/feature_rational' into feature_rational

Conflicts:
	sdetools/modules/sync_rational/rational_plugin.py
Merge remote-tracking branch 'origin/feature_rational' into feature_rational
Merge remote-tracking branch 'origin/feature_rational' into feature_rational
Merge remote-tracking branch 'origin/feature_rational' into feature_rational
Merge remote-tracking branch 'origin/feature_rational' into feature_rational
Merge remote-tracking branch 'origin/feature_rational' into feature_rational

Conflicts:
	sdetools/modules/sync_rational/rational_plugin.py
Merge remote-tracking branch 'origin/feature_rational' into feature_rational
- fixed unknown class HTTPError in raise
- reintroduced certificate loading code