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

[Olivier Tilloy]

319	+                end: new Date()

This is actually not needed at all, if no 'end' marker is specified, the timeframe will be open on this side, which suits our use case.
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https://code.launchpad.net/~artmello/webbrowser-app/webbrowser-app-bookmarks_top_sites/+merge/224592
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