EDITING: update workspace styling

Checklist:

- [x] update empty text
- [x] hide authors field
- [x] hide summary
- [ ] Remove published content search bar
- [ ] Add Search for workspace and published content
- [ ] Add Status column

Screenshot:
![image](https://f.cloud.github.com/assets/253202/2409514/4a6b8a52-aab0-11e3-9bbe-1c430957a00b.png)

Mockup:
![workspace-mockup](https://f.cloud.github.com/assets/1394695/2412027/ca2175aa-aacd-11e3-8039-46a7152b60e7.png)


http://mountainbunker.org/~schatz/ed/icons.html contains some alts for icons