[Merge] lp:~artmello/webbrowser-app/webbrowser-app-changes_on_new_tab into lp:webbrowser-app

[Arthur Mello]

> In Favicon.qml:
> 
>  - the id is unused, it can be removed
> 
>  - you need to add an import for "Ubuntu.Components 0.1", as you’re referring
> to units.dp(), which is part of the Ubuntu UITK

Fixed on r620
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https://code.launchpad.net/~artmello/webbrowser-app/webbrowser-app-changes_on_new_tab/+merge/226300
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