Enhancement security

! Common security gaps have been closed but I should think things thoroughly here in future.
+ Consts class with constants (ME, and Security constants have been implemented)
! LoginLastTime is not working yet. I know why, but don't known how i can fix it.
! See server warning logs. From now all service layer exceptions (included security) will be posted here.
! getAllUsers becomes protected from ROLE_USER (Only ROLE_ADMIN has have access here)