Merge pull request #9205 from EverythingMe/progress-indicator

[Bug 862310] Add network progress indication to apps/smart folder [r=crdlc](cherry picked from commit e3696dee033b6c0d8f77ebb59b99c3f29b6ff79e)

Conflicts:
	apps/homescreen/everything.me/js/Brain.js
(cherry picked from commit 5cbb19e4bb78a7ad879fbe4b9a841e1c35714f5c)

Conflicts:
	apps/homescreen/everything.me/js/Brain.js
	apps/homescreen/everything.me/modules/Apps/Apps.css
	apps/homescreen/everything.me/modules/SmartFolder/SmartFolder.css
	apps/homescreen/everything.me/modules/SmartFolder/SmartFolder.js