Stub: scaffold classes for custom authentication details (remember me)

BMS-84

Reviewer: Daniel Villafuerte
Update: messageSource in servlet-context, supports Jackson JSON spring auto mapper, implemented mvc:annotation-driven for @ResponseBody support

BMS-119

Reviewer: Daniel Villafuerte
Feat: Initial implementation of backend service for registering user (no user assigning roles yet), new stub for tests

BMS-119

Reviewer: Daniel Villafuerte