Texture-mapping scene added - image loading fails

Scene configuration for a textured quad. All of the image loading seems
to fail. Desperately need verification testbed for util::Image. Also
need to make sure std::runtime_error is thrown in all the points of
failure.
VerifyImage project added

Wrote application 'VerifyImage' which procedurally generates images,
loads them in various ways, compares them, etc. This program will trip
any issues with libpng, jpeglib, and util::Image. It relies on a few
externally verifiable test images
("./media/textures/test/procedural-reference.*").