Update spec link

Update the spec link and avoid pointing to the spec twice.
Update srcset spec link
data update
Merge pull request #677 from zcorpan/patch-1

Update spec link
Merge pull request #678 from zcorpan/patch-2

Update srcset spec link
Update spec URL for <script defer>
data update
data update
Merge pull request #680 from brettcannon/patch-2

Update spec URL for <script defer>
add CSS.supports() and CSS touch-action property
Merge pull request #681 from yisibl/master

add CSS.supports() and CSS touch-action property
rename CSS.supports file
Minor changes to css-touch-action
Fixed iframe seamless attribute's status and link
data update
Merge pull request #683 from emersonveenstra/iframe-seamless-fix

Fixed iframe seamless attribute's status and link
data update(IE 10)
Merge pull request #686 from yisibl/master

data update(IE 10)
data update
data update