Fixed context uint test
Another IE 11 test workaround.  The test passed when ran alone.
Fix texture test
Updated CHANGES.md
Fixed falsely reported active uniforms in IE 11 for geometries and models
Fix subtle model picking bug introduced in 895987af3603429f73af4a7a31a82930ca44150d and exposed in IE 11. If the shader program for the color command had uniforms optimized out that were not also optimized out in the pick command, the uniform map for the pick command did not contain the uniforms.
Remove old test
Fix billboard test in IE 11
Cleaned up some Runtime errors
Merge pull request #1843 from AnalyticalGraphicsInc/ie11-fixes

More IE 11 fixes