Merge pull request #1989 from pjackson28/v3.0

Corrected Grid System name.
Tabbedinterface: use DOM operations to create mobile view

* Preserves event handlers on tabbed interface panel content
* Prevents double-enhancement of elements by jQuery Mobile
Merge pull request #2000 from patheard/tabbed-multimedia

Tabbedinterface: use DOM operations to create mobile view
Merge pull request #2021 from pjackson28/master

Changed span to small for title subline. Added subline to base theme. Corrected font size of subline in about popup.
Resolved merge conflicts.
Added mobile view support for nested div elements in mega menus (#2009).
Merge branch 'v3.0'