added tournament model
Merge pull request #19 from sdford/teamAndBracketRelationships

Added Tournament model and relationships for Team and Bracket Models
Added validation for family physician
Various changes to help student context tests pass
Updated some scopes'
Added validation for student age to registration
Made some changes to the populate file
tryin to fix factories
didn't actually add anything but ok
fixed some errors in student test file
Fixed lots of errors, updated factories, added methods to student
Removed fixtures
added ?"