Extend our fragment shader for soy.materials.Colored in the gles2 branch of libsoy. This should support setting the same color properties as available in the Colored material class of our default branch.

While working on this task you should join and remain in #PySoy on Freenode to get help, feedback, and guidance from mentors and other developers. Code updates which may affect your work are also announced here as they happen.

When you've done, commit your work and post the resulting changeset url to this task.