Bug 876815 -[usage] don't mention phone calls in settings sub-header
Merge pull request #20356 from gitmai/bug-876815-settings-headers

Bug 876815 -[usage] don't mention phone calls in settings sub-header
r=salva
Bug 1025565 - Only render the necessary icons when dragging. r=kgrandon

Dragging an icon previously caused all icons from the first icon that needs
re-rendering to the end of the grid. This makes sure that only the icons
that are affected by the rearrangement are re-rendered.
Bug 987063 - Split the Gaia UI tests in Travis into smaller chunks. r=zcampbell