CSS fixes for new mezzanine

  - Buttons cutoff on Filer page with new Mezzanine
  - clone page form
  - Commit and Approve buttons look disabled (fixes #205)
Remove breadcrumbs from popups.
Moved Preview and Diff links in commit form
Touched up the filer css

- repositioned the object-tools all the way to the right
- fixed up some specificity problems with the popup
Fix datetimefield in commit popup
Merge branch 'mezzanine-style-fixes2'

* mezzanine-style-fixes2:
  Fix datetimefield in commit popup
  Touched up the filer css
  Moved Preview and Diff links in commit form
  Remove breadcrumbs from popups.
  CSS fixes for new mezzanine