[Merge] lp:~abreu-alexandre/webbrowser-app/container-extension into lp:webbrowser-app

[Alberto Mardegan]

> would it be better if I used a synchronised Qt.createQmlObject('<with
> source>') instead
> to remove the Loader bit?

This looks like a good compromise: it allows the extension to live in the QML word, and doesn't suggest that we want the extension to return something visible.
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https://code.launchpad.net/~abreu-alexandre/webbrowser-app/container-extension/+merge/278870
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