[load] quota issues "add workout"  #42

* support quota-challenge: every "add workout" i dont update all users,
but instead update only coming workout, and the cache. Hence i make sure
that after registration, user is added to cache as well.
* hence, UI changes - when call to "createAccount" and then to
"benchmarkCreateAccount" - pass the first and last name so i can add to
cache. and change controller respectively.
* history no more is stored in Trainee object. only read from DB and
sent to UI.