Adding notes to README to direct effort where it is most needed.

Lots of small features could be added to Amy, but we need to concentrate on things that will make it usable by non-programmer admins in January 2015.
Updating notes to README
Starting to build an instructor lookup form
More work on a form to find instructors near a location
First working version of instructor lookup form.

1. Fixed bug in migration script to populate people's airports correctly.
2. Regenerated `db.sql` accordingly.
3. Fixed airport search logic in `match` view.
4. Modified template to display correctly for both `GET` and "no matches found".
Added have_qualifications method to Person QuerySets.

This commit adds a new method to Person QuerySets called
have_qualifications. It takes a list of Skill objects and
returns only those Person objects which have ALL of the
listed skills. I also added a usage note to the "match" view.
Merge pull request #3 from rbeagrie/instructor-search-form

Added have_qualifications method to Person QuerySets.
Adding checkboxes for skills dynamically.

The set of skills instructors have may vary dynamically, so the instructor matching form builds the list on the fly.
Filtering by qualification (incorrectly)
Debugging
Filter persons with skills using qualification as an intermediate table.
Correcting filter bug in instructor skills query
Merging from master
Merge pull request #80 from gvwilson/instructor-search-form

Adding instructor search form
Merge pull request #72 from gvwilson/adding-notes-to-readme

Adding notes to README to direct effort where it is most needed.