Initial revision
Removed hibernate validation dependency
Changed the deprecated "facelets.SKIP_COMMENTS" to "javax.faces.FACELETS_SKIP_COMMENTS"
Temporarily added dummy values to test validation
Disabled bean validation constraint GroupMustExist and replaced with Java code. There seems to be some weird behaviour where CDI is not supported in bean validation Validator class even though it's 1.1 en JEE7.
Gave the form an id
Added methods to find a user or group by name
Finished validation
Started to add support for validation