add CSS3 image-orientation
add picture element data file
update spec url
update spec status. Looks like picture element is not an official spec by W3C. Somebody needs to review this commit
add demo link
add picture element support for IE. The spec url indicates that the implementation for IE is not there yet
The spec url indicates no information on implementation
update support for all the platforms. Almost all set to unknown
update keyword usage percentage
fix webplatform history docs link
Merge pull request #491 from calvinf/patch-1

fix webplatform history docs link
data update
data update
Update vibration.json
Changed placeholder support for Android 4 & 4.1

Android 4.0 and Android 4.1 Browser and WebView doesn't show up the placeholder for <input type=\"number\"> field, link: https://code.google.com/p/android/issues/detail?id=24626
data update
Merge pull request #493 from kennethlynne/patch-1

Update vibration.json
Merge pull request #494 from Windstalker/patch-1

Changed placeholder support for Android 4 & 4.1
data update
Added bug

Added bug describing the border collapse issue for table that need border radius.