fix getActiveMap
Merge pull request #241 from greggman/fix-webgl-test-utils

fix getActiveMap
add getPrefixedProperty
add fullscreen utilities
add test that framebuffers don't lose content when switching in/out of fullscreen
Merge pull request #242 from greggman/add-fullscreen-test

Add fullscreen test
update framebuffers-keep-contents-exiting-fullscreen-mode

Keep the red rectanlge at all times. Add explanation
Merge pull request #243 from greggman/update-framebuffers-keep-contents-exiting-fullscreen-mode

update framebuffers-keep-contents-exiting-fullscreen-mode
Incorporated bug fix from Jun Jiang causing conformance/textures/gl-pixelstorei.html to fail.
Merge pull request #244 from kenrussell/checkrect

Incorporated bug fix from Jun Jiang causing conformance/textures/gl-pixe...
Add test for uniform/attribute naming conflicts.
Merge pull request #245 from greggman/add-naming-conflict-test

Add test for uniform/attribute naming conflicts.
Fix Demos

San Angeles was disabling attribute 0
Particles was using uninitialized textures and still had lost context
simulation enabled.
Merge pull request #246 from greggman/fix-demos

Fix Demos
move readme to README.md
Merge pull request #247 from greggman/move-readme

move readme to README.md
Expanded getShaderPrecisionFormat test. Added test verifying highp and GL_FRAGMENT_PRECISION_HIGH support in fragment shaders.
Removed commented-out code per Gregg's review.
Merge pull request #248 from kenrussell/shader-precision-format

Expanded getShaderPrecisionFormat test. Added test verifying highp and G...
Tightened up constants and methods tests so that the addition of any unknown properties or functions will cause the tests to fail. This change will require these tests to be updated if future versions of the spec are released which add new properties to the WebGLRenderingContext, but the current situation where implementations may accidentally expose properties without failing these tests is unworkable.