Bug 893023 - Replace assets
Merge pull request #10958 from crh0716/1.1hd/893023

Bug 893023 - Replace assets r=rexboy, a=hd+
Bug 893694 - Update the 1.5x version of images.
Bug 881149 -  hdpi/xhdpi resolution layout for Homescreen app
     1. adjust to show 4 x 5 grid on WVGA.
     2. modify the scale ratio of app icon according to
        window.devicePixelRatio.
     3. Add 1.5x graphics (not complete, some assets are still missing)
Merge pull request #10947 from RudyLu/homescreen/v1.1.0hd

Bug 881149 - hdpi/xhdpi resolution assets and layout for Homescreen app. 
  r=crdlc. a=hd+.
Merge pull request #10971 from evanxd/bug-893694-v1.1.0hd

Bug 893694 - Bug 893694 - [Calendar] Update the 1.5x version of images for Calendar App
Bug 891277 - Update Usage assets, r=me
Bug 893710 - hdpi resolution tweaks for System app
Merge pull request #11004 from cctuan/hd-893710

Bug 893710 - hdpi resolution tweaks for System app