Allow Uint16Arrays uploads for texture_half_float
Specify reading from missing attachments

readPixels/copyTexImage2D/copyTexSubImage2D should generate INVALID_OP when reading from a missing attachment.
Changed oes-texture-float-and-half-float-linear tests to allow failure during glGenerateMipmap. This addresses https://github.com/KhronosGroup/WebGL/issues/408 .
moved EXT_sRGB from draft to community approved
moved EXT_frag_depth to community approved
Merge pull request #569 from msc-hi/master

Add EXT_color_buffer_float proposal.
Add test for EXT_srgb.
Add extra ANGLE test for scoped structures.

Because ANGLE internally uses a renaming scheme for scoped structures,
it's possible for the user to make certain structurse that conflict
with the internal scheme and cause link errors.

This bug only manifests in Firefox, not Chrome, because Chrome uses a
preliminary shader rewriting pass that hashes all variable names. It is
still possible to trigger from Chrome internal shaders and with
ANGLE as a standalone driver.
Merge pull request #572 from jamiemadill/scoped-structs-angle

Add extra ANGLE test for scoped structures.
Fixed relative links to CSS and image resouces.
Merge pull request #573 from kenrussell/latest-spec-links

Fixed relative links to CSS and image resouces.
1.0.1 and 1.0.2 versions of webgl-debug-shaders test had errors and weren't spec-conformant.
Merge pull request #574 from toji/debug_shader

1.0.1 and 1.0.2 versions of webgl-debug-shaders test had errors
Add struct scope variable masking test.

GLSL allows the shader to define a new inner struct with the same name
as an outer struct. Moreover, you can declare variables of the outer
type, then redeclare the struct, then declare a variable with the new
type. Currently this is broken in ANGLE.
Merge pull request #575 from jamiemadill/scoped-struct-masking

Add struct scope variable masking test.
Query table for getVertexAttrib

- Add VERTEX_ATTRIB_ARRAY_DIVISOR
- Add VERTEX_ATTRIB_ARRAY_INTEGER
Integer Vertex Attribute return values, getSamplerParameter and getInternalformatParameter

Add return types for Integer Vertex Attribute return values.

Describe how the getVertexAttrib method will return attributes loaded
via vertexAttribI* family.
Removing unused CSS class
Remove TODO from generated IDL
Merge pull request #576 from grorg/remainder-query-tables

Query tables for getVertexAttrib and getSamplerParameter