Java Marine API v0.7.0

New Features

• AbstractSentenceListener; base class for creating listeners with automatic
  sentence type resolving and casting.
• Support for ROT sentences (vessel's rate of turn)

Changes

• SentenceId; fixed a bug in parseStr(), sentence id length was assumed to be
  exactly three chars. This prevented parsing proprietary sentences that may
  have ids of different lenghts.
• PositionEvent; fixed speed returned in knots instead of km/h.
• TalkerId; added new id 'CP' (Channel Pilot).
• SentenceReader; refactored and removed duplicate code.
• Javadoc improvements