Avatar feature:  finished
- added application helper method  #gravatar_for(email)
- cuc specs and steps, view specs
UserManagement:
- added cuc specs and specs for deleting user account
- cuc step for Back button
UserManagement: added redirects to routes to handle malicious paths for user management
 - redirects to 404 for requests not handled by devise
UserManagement:
- add spec for devise helper #devise_error_messages_flash
UserManagement:
- added first and last names to User model
- updated validations for User
- updated User factory
- schema and migration
UserManagement: fixed minor spec error