Merge branch 'release/0.4.0'
Fix url generation and settings for Sentry 6.0
Bump version to 0.5.0
Merge pull request #14 from ideadevice/master

Fixes for Sentry 6.0.0 compatibility
Merge remote-tracking branch 'origin/master' into develop

Conflicts:
	sentry_hipchat/models.py