Add role model
Update sampledata to give patients a 'default' role
Order vitalinfos relationship on patient
Serialize last check in as the latest vitalinfo object. Change sampledata and server to not set last check in as last checked in date
Patients serialize last vitalinfo as last_check_in
Move data from patient to vitalinfo
Set latest_check_in on patient when vitalinfo is added
Set latest_check_in on sample data
Remove unused import
Remove name property from patient
Add login method to server
Merge pull request #26 from jcgharvey/roles

Add roles to the data model