Persist clock mode in settings
Add fallback for devices without mozSettings
Add indexedDB to store clock settings, change storage location from global to indexedDB for clockMode
Merge remote-tracking branch 'origin/master' into clockmode_settings
Change storage method for clockview from indexeddb to asyncstorage, fix some jshint warnings
Lets exclude debug code
Re-enable the date
Merge pull request #7708 from comoyo/clockmode_settings

Bug 822628 - Persist clock mode