Bug 936215: Hide contacts list while showing overlay.
Bug 920524 - [Clock] Timer sound selection does not preview sound

r=jugglinmike
Merge pull request #13489 from wanderview/contacts-overlay-hide-list

Bug 936215: Hide contacts list while showing overlay.  r=jmcf
Bug 920839 - ARIA fixes to value selector.
Bug 920839 - Added spinbutton ARIA markup to value picker.
Merge pull request #13368 from eeejay/bug-920839

Bug 920839 - Value Selector accessibility improvements. r=timdream