Added a supplemental "Extensions" spec#32

Merged

sgraham merged 4 commits intow3c:gh-pagesfrom toji:gamepad_extensions

Sep 16, 2016

+364

Commits on Jul 30, 2016

Merge remote-tracking branch 'w3c/gh-pages' into gh-pages
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committed

Commits on Sep 12, 2016

Added a supplemental "Extensions" spec
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committed

Commits on Sep 13, 2016

Addressed feedback on extension spec from @cvan
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committed

Commits on Sep 16, 2016

Updated haptics spec to a portion of @kearwood 's proposal
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