add a db seeds file

currently creates one student and one guardian, with the associated user
identities

this should allow you to log in with:

  testguardian / password

or:

  teststudent / password
add a db:redo rake task

drops the database, recreates it, migrates, and runs seeds, effectively
resetting everything

needs to be run with the server killed otherwise postgres will refuse to
drop the database
fix the guardian profile show page
Merge pull request #26 from rwarbelow/saturday_morning_setup

Saturday morning setup