Update font-feature.json

IE Mobile 10 does support font-feature-settings, like IE 10+ on desktop
Update viewport-units.json

Inserted information of lack of vmax support in IE10.
Merge pull request #620 from zoltan-dulac/patch-1

Update viewport-units.json
Update font-feature.json

Removed comma at the end of the file
Merge pull request #619 from victorbritopro/patch-1

Update font-feature.json
Add folder for full data jsons
data update