Drawing with null CURRENT_PROGRAM should error.

This is actually Chrome's behavior already. Firefox ignores it, in line with the GLES2 spec.
Merge branch 'draw-null-program' of github.com:jdashg/WebGL into draw-null-program
Add a conformance test for null-program draws.
Merge pull request #510 from jdashg/draw-null-program

Drawing with null CURRENT_PROGRAM should error.
Test deleteVertexArrayOES of currently bound VAO reverts binding to null.

This test is passing with exception of current Chrome Android on ARM & Imagination
GPUs due to Chrome workarounds.
Merge pull request #519 from vmiura/oes_vao_binding_test

Test deleteVertexArrayOES of currently bound VAO reverts binding to null...
Per resolution of WebGL working group, added previously-removed
IMPLEMENTATION_COLOR_READ_FORMAT and IMPLEMENTATION_COLOR_READ_TYPE to
latest WebGL 1.0 spec. Updated earlier conformance suites to allow these
constants to be present, and top of tree conformance suite to require them
to be present.
Merge pull request #520 from kenrussell/implementation-color-read-type-format

Per resolution of WebGL working group, added previously-removed
Do not show 1.0.1 and 1.0.2 test subsets in version selector

The version selector in the latest version of the conformance suite seems
to be misleading. It suggests to people new to the conformance suite that
they're running the 1.0.1 or 1.0.2 tests, when in fact some of the tests
in the subset might be updated to increase coverage after the old version
of the test suite was frozen. Remove 1.0.1 and 1.0.2 from the selector to
reduce confusion.
Merge pull request #521 from NVIDIA/restrict-subset-selector

Do not show 1.0.1 and 1.0.2 test subsets in version selector
Remove outdated spec section about implementation color read format

IMPLEMENTATION_COLOR_READ_TYPE and IMPLEMENTATION_COLOR_READ_FORMAT were
reintroduced to WebGL recently. Remove the section that still claims
they're not included.
Merge pull request #523 from NVIDIA/clean-outdated-color-read-spec

Remove outdated spec section about implementation color read format
Corrections to WEBGL_compressed_texture_atc spec and conformance test
Merge pull request #524 from toji/atc_update

Corrections to WEBGL_compressed_texture_atc spec and conformance test
Enum typo: INVALID_OPERATION -> INVALID_VALUE
Expanded oes-texture-float test to verify readback of floating-point values from the framebuffer if the implementation supports it.
Merge pull request #525 from kenrussell/impl-color-read-format-type

Expanded oes-texture-float test to verify readback of floating-point val...
Added missing redirect pointed out by Jon Leech.
Merge pull request #528 from kenrussell/idl-redirect

Added missing redirect pointed out by Jon Leech.
Attempt to add MIME type to redirect to get it to take effect.