Include user in login result

The first commit is unrelated, it improves the ngdoc documentation generated by loopback-angular.

The second commit implements the necessary changes.

Close #161. See also #162.

/to: @ritch please review
/cc: @raymondfeng 
/cc: @seanbrookes This change should simplify your iCars controllers, as you don't have to send two requests on login (`User.login`, `User.get`).