[Merge] lp:~kai-mast/friends-app/new-postview into lp:friends-app

[Kai Mast]

Just discovered that the header did not hide anymore when flicking the content. This bug is already occuring in trunk so I guess it was introduced by my Tabs branch.
To fix this, I made the Feed item a Page and set flickable: listView. Now, the header hides again. 

But the content below the header is still clipped, which seems to be this bug: https://bugs.launchpad.net/ubuntu-ui-toolkit/+bug/1250067

@Ken: would be nice if you could review it again :)
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https://code.launchpad.net/~kai-mast/friends-app/new-postview/+merge/197537
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