Grid icons: added padding-right to rel='external' links in lightbox
Tabbedinterface (mobile): allow URL hash to determine active tab to display
Merge pull request #2457 from patheard/mobile-default-tab

Tabbedinterface (mobile): allow URL hash to determine active tab to display
Merge pull request #2455 from patheard/rel-external

Grid icons: added padding-right to rel='external' links in lightbox
Merge pull request #2461 from EricDunsworth/v3.0-formvalid-error-margins

Removed extra left and right margins from error container's children in ...
Form validation: Fixed invalid SCSS extend to a non-existent placeholder.
Merge pull request #2478 from pjackson28/v3.0

Form validation: Fixed invalid SCSS extend to a non-existent placeholder
Fixed margin-right-0 placeholder selector issues in form validation SCSS.