Integrating feedback on final documents. Removing under construction warnings
Subedited emrun document.
Update AUTHORS
Add test for creating gl contexts in a main loop and using -s FULL_ES2=1. This will fail with the following JavaScript exception "Uncaught TypeError: Cannot set property '0' of undefined" in GL.newRenderingFrameStarted()
Test for a current GL context before beginning a new rendering frame.
Merge pull request #2810 from ricochet/no-current-context

Handle no current context when rendering in a main_loop
Merge pull request #2807 from hamishwillee/incoming

Incoming - final update
do not warn on missing builtin libs like GL; #2808
Support for readonly (const) attributes.
Automatically call Pointer_stringify on DOMString return values.
Integrate fixes to emrun doc as result of feedback from ChrisM
fix link
Merge pull request #2814 from hamishwillee/incoming

Integrate fixes to emrun doc as result of feedback from ChrisM
add test for #2789 testcase 2
Merge pull request #2813 from artillery/webidl-domstring-returns

WebIDL: Automatically call Pointer_stringify on DOMString return values.
Update documentation for readonly attributes.
Fix the return types for the SIMD comparisons.
Add a declaration for SIMD.float32x4.select
Remove unnecessary bitcast operators
NaN and -0.0 aware _mm_max_ps and _mm_min_ps

This uses a compare and a select in order to match the x86 semantics
precisely for NaN and -0.0.

This patch also adds the emscripten_float32x4_select function.