Wrap rename and move templates with admin.

1. Add templates kwargs to url_admin.py.

2. Add rename, move block div to admin/base.html.

3. Add rename and move admin template files.

4. Extend rename, move templates with admin/base.html.
Add CLOUD_BROWSER_CACHE_SECONDS.
Add error handling, message info and logging to upload, mkdir, delete, move and rename.
Add functional tests for cloud browser views.