v1.3:

Changed Issues:
- Issue 54: Error occurred by setLatLng method with LabeledMarker
  http://code.google.com/p/gmaps-utility-library-dev/issues/detail?id=54
- Issue 73: LabeledMarker click event does not pass thru click coordinates 
  http://code.google.com/p/gmaps-utility-library-dev/issues/detail?id=73 
- Issue 19: Need a setLabelText function in LabeledMarker
  http://code.google.com/p/gmaps-utility-library-dev/issues/detail?id=19 

Public Changes:
- Removal of showLabel/hideLabel methods in favor of setLabelVisibility
  http://groups.google.com/group/google-maps-utility-library/browse_thread/thread/2099a45b76dc6dbe/166219d409a6d0f2
- Various changes in the way visibility works:
  Allow setting visibility before .initialize()/.addOverlay(); 
  Provide consistent label visibility control aligned with visibility of the marker itself; 
  Fix the issue that the marker is always added to a map in visible state regardless of any visibility settings applied before
  http://groups.google.com/group/google-maps-utility-library/browse_thread/thread/2099a45b76dc6dbe/da6cec86f0aab106

Internal Changes:
- Removal of internal latlng_ property and setLatLng() method as they were not needed
- JSDoc comments changed to prevent technical details from appearing in API reference
- Update of copy method to accommodate new API features
- Code style fixed to accommodate jslint
- Fix to the event passing mechanism:
  http://groups.google.com/group/google-maps-utility-library/browse_thread/thread/2099a45b76dc6dbe