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/message.rb

@@ -1,6 +1,5 @@
 class Message < ActiveRecord::Base
   belongs_to :user
-  attr_accessible :creator_id, :message, :read, :receiver_id
   validates_presence_of :creator_id, :receiver_id, :message
 
   def creator_name