Zoom around point reimplemented.  Added animation interface at view controller level.
Optional per feature vector colors.
Trying out an all-in-one pinch delegate.
Wrong coordinate system in bounding box query.
Merge branch 'master' into develop
Added vis range to view tracker.
Fixed a strange crash.
Billboards now handle selection.
Merge branch 'develop' of https://github.com/mousebird/WhirlyGlobe into develop
Pulled out the remaining points logic from the vector manager.
Fixed heading
Compile fixes
Wasn't dealing with empty tile layers for local data sets.
Binary vector format implemented.  Added tesselated mesh type to vectors.
Merge branch 'develop' of https://github.com/mousebird/WhirlyGlobe into develop
Sorted out new pinch delegate and updated the old rotation delegate to play nice with it.
Now considering northUp in pinch calculations.
Fixed animation to deal with heading.
Documentation update.  Markers support shaders (untested).  VectorManager was messing with extra attributes in change requests.
Wasn't properly releasing UIImages.