CAS-1262: Remove TGT dependency on TicketGrantingTicketImpl
CAS-1262: TGT id, which cannot be null, uniquely identifies the ticket such that its hash code is suitable as the whole ticket's hash code.
CAS-1262: Restored the static logger back. Static loggers are appropriate in this scenario since there are a lot instances of this class
CAS-1262: Removed transient annotation.
Merge pull request #202 from Unicon/CAS-1262

CAS-1262: Remove TGTImpl dependency on AbstractTicket