Storyteller: start interface for storyteller edit
Storyteller: adding missing template and image add interface
Fix styling regressions and use right video

The template refactoring introduced some regressions due to the
different order of the stylesheets. These are fixed now.
The storyteller now also uses the right video for the exhibition the
tour belongs to.
Storyteller-edit: adding post reorder
Post list styling and sorting functionality

- Initial styling of the post list with Bootstrap
- Sorting functionality via drag'n'drop with jQuery UI
Merge sorting functionality implementations

The backend part is kept as @colle did it, the styling is mine

Conflicts:
	muse/papacastoro/templates/papacastoro/post/posts_list.html
Fix double block in template and html syntax
Fix request
Merge branch 'master' into feature/storyedit
Set Post text to null=True and add papacastore tests
Remove ItemImage description field
Adding tour title in storyteller edit
Use italian tour title for storyteller edit
Update fixtures to agree with db modify
Merge branch 'feature/storyedit'