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

Gemfile

@@ -1,7 +1,7 @@
 source 'https://rubygems.org'
 
 #don't upgrade
-gem 'rails', '3.2.20'
+gem 'rails', '3.2.21'
 
 ruby '2.1.5'
 
@@ -56,6 +56,9 @@ end
 
 gem 'jquery-rails'
 
+## strong parameters in Rails 3 (see rails gem above)
+gem 'strong_parameters'
+
 # To use ActiveModel has_secure_password
  gem 'bcrypt'