Only show openid options if providers are set in User model.
fix: use ruby's way for interpolation
Merge pull request #311 from differentreality/openid

Only show openid options if providers are set in User model.
Set js_errors to false in poltergeist driver
Merge pull request #357 from gopesht/fix_flickering_test

Set js_errors to false in poltergeist driver
Adds migrations for call for papers updates in email settings
Email notification on cfp dates updates and schedule made public