Add delegate methods to shipment class

lib/planet_express/shipment.rb

@@ -10,6 +10,22 @@ module PlanetExpress
       @discounts = []
     end
 
+    def month
+      date.begin_of_month
+    end
+
+    def s_shipment?
+      shipping_option.s_shipment?
+    end
+
+    def l_shipment?
+      shipping_option.l_shipment?
+    end
+
+    def provider
+      shipping_option.provider
+    end
+
     def if_valid(&block)
       yield self
     end
@@ -19,7 +35,7 @@ module PlanetExpress
     end
 
     def inspect
-      "#{self.class.name} [#{date} #{shipping_option}]"
+      "#{self.class.name} [#{date} #{shipping_option.inspect} #{discounts}]"
     end
   end
 end