Install and configure Yubikey API client bundle.
Upgrade to Yubikey bundle 1.2.0.
Move createJsonResponseFromViolations() up in class hierarchy.
Add Yubikey verification API.
Provide default Yubikey parameters for CI.
Merge pull request #5 from SURFnet/feature/api-bundle-yubikey

Add Yubikey verification API
Merge branch 'develop' into feature/restrict-api-access

Conflicts:
	app/config/parameters.yml.dist
	src/Surfnet/StepupGateway/ApiBundle/Resources/config/services.yml