Bug 1014761 - improved the way utility tray visibility works with the screen reader.
Bug 1014775 - adding aria-live to notification toasters so they are announced with the screen reader.
Bug 1013783 - Shared styles missing 2x icons
Bug 1008020 - [Collections App] Jshint fixes r=amirn
Merge pull request #19561 from yzen/bug-1014761

Bug 1014761 - improved the way utility tray visibility works with the sc...
Merge pull request #19564 from yzen/bug-1014775

Bug 1014775 - adding aria-live to notification toasters so they are anno...
Merge pull request #19608 from jrburke/bug1013783-shared-styles-2x

Bug 1013783 - Shared styles missing 2x icons r=arnau
Merge pull request #19646 from KevinGrandon/bug_1008020_collections_jshint

Bug 1008020 - [Collections App] Jshint fixes
Bug 1009111 - Update build configuration
Bug 1009111 - Move dev_apps/home2 -> apps/vertical
Bug 1009111 - Move dev_apps/collection -> apps/collection
Python test updates.