add pharmacy model
add prescription fulfillment model
relate fulfillments to people and pharmacies
add fixtures and unit tests for pharmacy and fulfillment
display fulfillments on person and prescription pages
ensure that fulfillments have a pharmacy and pharmacist
use fulfillment data in xml documents
add ndc and rxnorm data to drugs table
use rxnorm and ndc fields in medication xml
fixed bug where I was using empty? and should have used blank?
expand prescription model
add phone field to people table
use URL's as ID's for objects that have URL's

Pharmacies don't have URL's so we'll keep the numeric ID.
fix our greencda xml namespace

The spec requires that the namespace begin with "urn:hl7-org:greencda"
and ours didn't.  Now it does.