Rename default confirm endpoint to be consistent with Spring default
Add errorEndpointUrl to configuration
Clean up BootStrap
Support multiple authentication entry points

Conflicts:

	SpringSecurityOauth2ProviderGrailsPlugin.groovy
Properly honor default redirectUri
Explicitly wire OAuth2 beans

Conflicts:

	SpringSecurityOauth2ProviderGrailsPlugin.groovy
Handle exceptions originating in endpoints properly