More debugging of dynamic drawables and textures.  A few memory leak fixes.  Some guard code in the label layer.  Fixed a crash (hopefully) related to changing the view state in a different thread.  Local matrices working again on drawables.  Put more guard code in the vector subdivision routine.
Merge branch 'develop' of git://github.com/mousebird/WhirlyGlobe into develop

Conflicts:
	WhirlyGlobeSrc/WhirlyGlobe-MaplyComponent/src/WhirlyGlobeViewController.mm
Merge branch 'develop' of github.com:jcollas/WhirlyGlobe into develop