- Normalise the verb for creating new files and subfolders to be POST.
 - Normalise the noun for folders in routes to be plural, following Ruby convention.
Implement creating new folders.
Make sure that we are uploading to an existing folder.
Fix the file upload form.
Say which directory was created.
Merge branch 'materials' of github.com:fuzzie360/coursemology.org into materials

Conflicts:
	app/views/materials/_form.html.erb