Add some properties to MockLockScreen.
Add paused attribute to MockAudio.

Unlike playing, paused is defined at:
http://www.whatwg.org/specs/web-apps/current-work/#dom-media-paused
Make MockLock return a request on set().
Make MockSettingsURL actually set its value on set().
Add MockDeviceStorage.
Add MockGeolocation.
Add minimal MockPermissionSettings.
Bug 938905 - Add a message panel to the lock screen.
Integrate Where Is My Fox into the System app.
Integrate Where Is My Fox into the Settings app.
Add a very simple test app for WhereIsMyFox.