Update audio-api.json

Web Audio API is still off by default in Firefox 23 and 24
https://wiki.mozilla.org/WebAudio_API_Rollout_Status
Update spdy.json

iOS7 does not support SPDY
Update css-fixed.json
Update deviceorientation's notes about chrome 31

Chromium/Blink supports the devicemotion event. It's available in Chromium 31.0.1639.0 (224567).
https://src.chromium.org/viewvc/blink?revision=158031&view=revision
https://src.chromium.org/viewvc/chrome?revision=224164&view=revision
data update
Merge pull request #303 from tfriedel6/patch-1

Update audio-api.json
Merge pull request #304 from ronkorving/patch-1

iOS7 does not support SPDY
Merge pull request #305 from Sladex/patch-1

Update css-fixed.json
Merge pull request #306 from syoichi/pr9-deviceorientation

Update deviceorientation's notes about chrome 31
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data update
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Update canvas.json

Android 2.x doesn't support toDataURL(), so I've downgraded it to partial support. (This is a critical function for some categories of canvas applications.)
Update eventsource.json

Tested in Win 7 IE11 (on BrowserStack): windows.EventSource did not exist.
data update
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Merge pull request #309 from DarrenCook/patch-1

Update canvas.json
Merge pull request #310 from DarrenCook/patch-2

Update eventsource.json
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Adding `min-height` IE10/IE11 known issue for CSS flexible box layout.