Added registration segment to display description, period

Controller test for Conference#show

houndci fixes

Rebased with single entry for navigation branding

Conditional rendering of splash navbar

db/migrate/20140528115842_add_registration_description_to_conference.rb

@@ -0,0 +1,5 @@
+class AddRegistrationDescriptionToConference < ActiveRecord::Migration
+  def change
+    add_column :conferences, :registration_description, :text
+  end
+end