+ reduced memory usage of RenderBucket by making "type" byte instead of int
+ improved code readability in TextItem by renaming variable
+ added latitude/longitude validation methods to GeoPointUtils
+ solved Java double precision problem in GeoPoint
+ made GeoPoint Serializable for easier Android usage
+ made BoundingBox.toString() human readable for better debugging
recycled variables were accessed non synchronized (and therefore non
thread safe) causing errors once multiple threads were used interacting
with the Viewport
lucaosten