Make it so you can run more tests at once

This CL allows you to run tests in semi-parallel or
at least as parallel as iframes are in browsers.

add frames=N where N is the number of iframes you want

Example:

    https://www.khronos.org/registry/webgl/sdk/tests/webgl-conformance-tests.html?frames=4
Merge pull request #94 from greggman/parallelize

Make it so you can run more tests at once
Fix URL filtering from parallelization CL
Merge pull request #95 from greggman/fix-parallel-update

Fix URL filtering from parallelization CL
Video tests loop can infinitely (thanks to Paul Adenot)

Because they forget to remove their event listener.
https://bugzilla.mozilla.org/show_bug.cgi?id=786331

This is causing timeouts in Firefox.
Return statement at non-function scope causes syntax error in Firefox
Firefox fails as this local test(x) function is only defined further down:
It's used on line 62 but is only defined on line 75.
Moving it above makes the test pass in Firefox.
Avoid relying on illegal/undefined JS behavior

According to JS people, it is not legal to define a function at anything else than global or function body scope.

Browsers still allow it, but have differing non-standard rules about that. That is what caused us trouble here.
Merge pull request #96 from bjacob/scissor-test

Firefox fails as this local test(x) function is only defined further dow...
Merge pull request #97 from bjacob/return-statement

Return statement at non-function scope causes syntax error in Firefox
Merge pull request #98 from bjacob/video-timeout

Video tests loop can infinitely (thanks to Paul Adenot)
Fixed minor grammatical issues in alert dialogs based on feedback from Chrome's testing team.
Merge pull request #99 from kenrussell/grammar

Fixed minor grammatical issues in alert dialogs based on feedback from C...
Stubbed in support for Safari
check in new test from mvujovic

Tests bug when deleting and recreating an element array buffer.
Merge pull request #104 from greggman/element-array-buffer-delete-recreate

check in new test from mvujovic
add .htaccess to .gitignore
Merge pull request #105 from greggman/htaccess

add .htaccess to .gitignore
Incorporated change from Kalyan Kondapally at Intel in https://bugs.webkit.org/show_bug.cgi?id=104259 .
Merge pull request #106 from kenrussell/depthtex

Incorporated change from Kalyan Kondapally at Intel in https://bugs.webk...