use AR counter cache for to cache the count of classifications
ensure the latest user_group : user classifcation counts
Validate user login presence
Case insensitivity for User login and email
add user_group to classification association with a cached_counter
Conditional password length validation for migrated users
Merge branch 'feature-user_validations'
Add SetMember counter to SubjectSet #27
Add SubjectCounts concern for Projects and Workflows
Use create instead of build
Use model sum to prevent having to load entire record