Moved EXT_blend_minmax, EXT_shader_texture_lod, WEBGL_compressed_texture_atc, WEBGL_compressed_texture_etc1, and WEBGL_compressed_texture_pvrtc to community approved after discussion on public_webgl list.
Merge pull request #603 from kenrussell/more-community-approved-extensions

Moved EXT_blend_minmax, EXT_shader_texture_lod, WEBGL_compressed_texture...