Bugfix events controller
Implements user and event state distribution
Merge pull request #223 from ChrisBr/distribution_dashboard

Implements user and event state distribution
Merge pull request #221 from ChrisBr/bugfix_event

Bugfix events controller
Add new gems in Gemfile
Create new table for openids and prepare openid configuration
implement openid authentication
test for openid authentication and necessary changes for normal login testing
add images of openid providers
change controller function