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Remove outdated spec section about implementation color read format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Merge pull request #523 from NVIDIA/clean-outdated-color-read-spec

Remove outdated spec section about implementation color read format