Revert "use MarkdownColumn"

This reverts commit 4d6218ff5c46b397df417265df20b503e0b61adf.
New space link only for siteadmins.
Fix title display on pages
Simplified layout.html; more markdown
Change library import order
Require sections to be public.
Support for feedback on sessions
Merge branch 'master' into composite-column

Conflicts:
	funnel/models/__init__.py
	funnel/views/__init__.py
Markdown flags are no longer required.