rough cut of getting rid of the matches collection being passed around

Associated Weight and Match-- the FK already existed in the domain
Reduced argument counts on assignLoserNames and assignBouts; trying to pass a Tournament around more
This was a tough nut to crack.  Looking back, I tried to eat too much of the horse at once on this refactor.

app/models/weight.rb

@@ -1,6 +1,7 @@
 class Weight < ActiveRecord::Base
 	belongs_to :tournament
 	has_many :wrestlers, dependent: :destroy
+	has_many :matches, dependent: :destroy
 
 	attr_accessor :pools