Split dashboard into single and multiple enterprise views

app/models/spree/user_decorator.rb

@@ -19,6 +19,10 @@ Spree.user_class.class_eval do
     end
   end
 
+  def manages_one_enterprise?
+    enterprises.length == 1
+  end
+
   def send_signup_confirmation
     Spree::UserMailer.signup_confirmation(self).deliver
   end