Make the menu label optional in the Django admin
features table
intro text tweak
Enforce slug uniqueness at the database level
Improvements to the Django admin
- Search for projects by owner, location, title, or slug
- select project owner with popup
Add IDs to all project sections based on the section slug

NOTE: This was removed in an earlier revision (e0807a1), but I'm not sure why. If we have to remove it again, it needs a note with the reason.
Fix the Shareabouts.js version.
Add a raw HTML section type
Merge pull request #70 from openplans/staging

Django admin, Shareabouts text, and raw HTML