Added: the <dialog> element

Please review carefully, this is my first update here ;-)
Changed link to point to the W3C spec
Merge pull request #162 from FremyCompany/patch-1

Added: the <dialog> element
Update W3C link of User Timing API

User Timing is already a W3C Recommendation.
srcset, main, and date controls in dev - fixes #38, #84
merge production
Fixed a bad status for the dialog element

"Under consideration" should be "Under Consideration".
There should be some test that makes sure this is one of the enumerated values.
Fix screen orientation data feed - fixes #165
Merge pull request #167 from phistuck/patch-2

Fixed a bad status for the dialog element
Flip dppx to preview release. Fixes #168
Merge pull request #164 from nextPrime/patch-5

Update W3C link of User Timing API
track keygen - fixes #88
Update css masks spec link - fixes #118
add media fragments - fixes #111
Add SMIL animation - fixes #151
add navigator.hardwareConcurrency - fixes #99
Add SharedWorkers - fixes #87
Testing deployment is fixed with a benign change
Merge pull request #2 from InternetExplorer/production

update