General pane web 2

Second round of general pane tweaks from https://trello.com/c/OBUND1Za/82-general-pane-client-alignment

To test:
 - New 'Show parent Projects and Datasets' button in right panel toolbar for Images should show containers. Click a second time to hide. Test with Well Images too, and in combination with 'Show file paths on server' button which loads content into the same panel.
 - File Annotations dialog should show a spinner while form content is loading.
 - Add Comment text box doesn't have the "Comments" label above it and instead has "Add Comment" placeholder text. The "Add Comment" button is only shown when the text box has focus. Test you can still add a comment OK.
 - The 'Owner' display has been moved under the object ID (3rd row). This works fine for Images but is not really an improvement for other objects. It actually uses more space than before in both cases (see screenshot). One difference with Insight here is that web shows creation date for P/D/S etc but Insight doesn't. How to align this?

![screen shot 2014-11-19 at 23 38 15](https://cloud.githubusercontent.com/assets/900055/5116996/3ad4074c-7047-11e4-8f5b-158462b43b64.png)

I haven't changed other labels to Title case in this PR since I think it is definitely worse:

![screen shot 2014-11-19 at 23 45 06](https://cloud.githubusercontent.com/assets/900055/5117017/9246bd8a-7047-11e4-8ba5-12d0125d3f0b.png)

--no-rebase