Removed redundant placeholder selector declaration in details SCSS.
Changed opened details to use child combinator selector in IE7-8 (via IE details SCSS). Prevents deeper child elements from inheriting "display: block;" properties.
Merge pull request #2378 from EricDunsworth/v3.0-details-placeholder-redundancy

Removed redundant placeholder selector declaration in details SCSS.
Merge pull request #2379 from EricDunsworth/v3.0-details-ie-combinator

Changed opened details to use child combinator selector in IE7-8 (via IE...
Fixed mobile menu to handle special menu structure identified in #2365.
Added link to project mega menu regarding the new mobile standard.
Merge pull request #2382 from pjackson28/addstandardlink

Added link to project mega menu regarding the new mobile standard
Corrected English link in mega menu update.
Corrected URL for Standard on Web Interoperability link in project mega menu.
Merge pull request #2383 from pjackson28/addstandardlink

Corrected English link in mega menu update and URL for Standard on Web Interoperability
Merge pull request #2381 from pjackson28/fixmobilemenu

Fixed mobile menu to handle special menu structure identified in #2365
Merge branch 'v3.0'