Added tests to UserREST.login
Refactored UserREST login to populate session itself
Remove HttpSession dependency in UserService phase 1 complete
Cover SecurityCheckProvider.SecurityCheckInjectable.cookieLogin with tests
Make cookieLogin handle HttpSession by itself
Delete method UserService.login(HttpSession) and copy body to callers
Rename method
Provide a SessionHelper to manage the session
Merge pull request #647 from rationalrevolt/userservice-tests

Remove dependency on HttpSession in UserService