Create the 'About content' widget

There should be an aboutcontent widget that has 2 different tabs. The first tab is the Details tab and shows the metadata of the content (title, description, url, created by). When a description is not available, it should not be shown. The second tab is the Shared with tab and shows the list of members of the content.
You could abbreviate these a bit:

```
casper.thenOpen(contentURL, function() {
    casper.waitForSelector('#content-clip-container .oae-clip-content > button', verifyContentClipButtonsAsManager);
});
casper.then(userUtil().doLogOut);
```