Fixed some problems with MaplyTexture vs. UIImage caching.  Can now tell the paging layer that we're working with parts.  Tweaking the pinch delegates.
Got rid of old sun direction stubs.  Fixed a problem with getPosition: in MaplyViewController.
Was ignoring zoom limits in pinch delegate.
Missing the new GDAL tile source.
Merge branch 'develop' of https://github.com/mousebird/WhirlyGlobe into develop
Merge branch 'develop' of github.com:mousebird/WhirlyGlobe into develop