Create media-attribute

First addition of media attribute file.
Update media-attribute

Firefox browser compatibility added, plus some links.
Update media-attribute

Added Chrome support indicators.
Update media-attribute

Added some more browser support options.
+ properties w/o viewport unit support in chrome < v34
Added Vibration API
Merge pull request #443 from kelunik/patch-1

chrome doesn't support viewport units
Merge pull request #444 from iandevlin/master

Added information on media attribute for the source element.
Merge pull request #445 from AurelioDeRosa/patch-1

Added Vibration API