Added SMS and MMS gateway that can handle a variety of messages formats along with a set of testes for it.

NOTE: this is the first patch submitted on ticket

db/migrate/039_add_sms_to_preference.rb

@@ -0,0 +1,11 @@
+class AddSmsToPreference < ActiveRecord::Migration
+  def self.up
+    add_column :preferences, :sms_email, :string
+    add_column :preferences, :sms_context_id, :integer
+  end
+
+  def self.down
+    remove_column :preferences, :sms_context_id
+    remove_column :preferences, :sms_email
+  end
+end