Rearrange compatibility table

This PR rearranges the compatibility table. The columns and rows are now sorted based on compatibility. The ordering principle I used was "least red", "most green", "alphabetical". This order is almost the same that was shown in my picture at https://github.com/andyet/iswebrtcreadyyet.com/issues/27 The position of "dataChannels" row is different because I decided to order the items of same compatibility level alphabetically.