Added support for elevation chunks in the Component interface.  Added a helper for handing elevation data to existing tile sources.  Put together a test mode for elevation in the tester app.
Fixed a problem with skirts in elevation mode.  Fixed a problem with lower res fill in tiles in elevation mode.
Added multi-texture support in low level drawables.
Refactored the way image fetching works.  Now have tiles sources and a single quad image tile layer.
Fixed a header file.
First version of elevation tile pyramid generator.  Not done yet.
Updating libjson
Merge
Added support for a multiplexing tile source that lets you put multiple tile sources into an animation.  Hooked up custom shader support in the new quad image layer.
Untaggled a locking issue that was glitching the main thread when asking for frame switches in the tile quad loader.
Hooked up an animated weather example.
Fixed a cleanup bug.
Filled out the elevation support a bit.  Added two new utilities for constructing elevation databases.
Can now output elevation pyramid directly from elevation_tile_pyramid.
Got rid of separate assemble pyramid program
Progress reporting working now.
Exposed elev attribution for shader.
Tweaked ImageChopper usage.
Updates to the elevation pyramid now working.  Now reading shapefiles to create sparse data sets.
Now checking if we have an elevation source in the image layer.  If we do then we give the tiles some height so they show up (more or less) correctly in the display.