Use local files (with bower)

copied to 3rdparties manually so that we don't have bower_modules in the app
Remove firefox app installation
remove favico

doesn't make much sense in an app...
add cordova, hide splash screen when loaded
Implement system notifications with cordova

Removes our manual sound notification, this is the platform's job in an app.
Also don't expect Notification to exist, mobile Chrome doesn't know it
Update landing page text for app, design fixes

Replaces mentions of 'browser' with 'device', remove installation instructions,
change encryption instructions to reflect situation in the app

Increases tap target in buffer list again
Add support for FirefoxOS
Add 256x256 logo, remove unused png