Added note about Firefox rendering quirk
Update features-json/apng.json

Added 'no' to Chrome 25-26 APNG support (tested on Canary builds)
data update
Merge pull request #118 from SagePtr/patch-1

Update features-json/apng.json
Merge pull request #116 from cbirdsong/patch-2

Added note about Firefox rendering quirk
data update