This includes a small change to our custom material task because old
gradle passed only the contents of out-of-date directories, newer gradle
passes both the contents and the directory itself.
* WIP Add helper to upload Android bitmaps to textures
* Add missing file
* Pass custom constants for bitmap formats
* Add sample app for texturing
* Update the README for samples
* Rename variable from callback to autoBitmap
Romain Guy
Philip Rideout