On branch strong-params

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I'll pull to catch up after this commit
Change code to whitelist params
Remove attr_accessible lines
Add strong_params to Gemfile, since this branch is still on Rails 3
Mixin to ActiveRecord::Base ActiveModel::ForbiddenAttributesProtection
Use an initializer for the mixin

app/models/performance.rb

@@ -1,5 +1,4 @@
 class Performance < ActiveRecord::Base
-  attr_accessible :comments, :date_submitted, :reviewer, :score
   belongs_to :user
 
   def reviewer_name