Added user preference (server-side) support (load/save) to [jabbr/components/client-settings]
Added PushNotifications section to ChatUserPreferences and [jabbr/components/client-settings]
Fixed updateElementValue function in [jabbr/components/client-settings]
Finished off NotifyMyAndroid server-side notification support
Finished off Pushover server-side notification support
Merge branch 'feature/push-notifications' into dev