Grids SCSS: Adjusted module-news-article's padding/margin properties.
Prevents a "double" top spacing effect when images aren't used.
Slide out tab SCSS: Redeclared display block placeholder selector in IE7-8.
Prevents details/summary elements from being treated as inline by IE7-8. The :not pseudo-selector's presence in the standard SCSS file causes the entire placeholder selector's outputted rule to be ignored by those browsers.
Merge pull request #3244 from EricDunsworth/v3.0-grids-news-article-img

Grids SCSS: Adjusted module-news-article's padding/margin properties.
Merge pull request #3246 from EricDunsworth/v3.0-details-ie-display-block

Slide out tab SCSS: Redeclared display block placeholder selector in IE7-8.
Merge branch 'v3.0'