Bug 824609 - [Open_]icons display errors
Bug 830644 - Support WVGA and other non-HiDPI screen dimensions and resolutions
     * sms: px to rem, added background size definitions, removed unnecesary css calcs
     * responsive.css: adjusted mediaqueries to do not target desktop screens
     * added @2x assests for sms
Merge pull request #8461 from gasolin/issue-824609

Bug 824609 - [Open_]icons display errors r=alive
Bug 847264 - Allow customizing poweroff animation.
Merge pull request #8463 from rexboy7/fix-bug847264-poweroff

Bug 847264 - Allow customizing poweroff animation.
Merge pull request #8444 from basiclines/responsive-ui

Bug 830644 - Support WVGA and other non-HiDPI screen dimensions and resolutions
Merge branch 'master' into master-local