Convert WebGUI::Shop::Products over to be object oriented.

Update the tests and Content plugin for the Shop.
Add the Products screen to the Shop admin screen.
Add exception handling to www_import.
Add a status message to the manage products screen.

lib/WebGUI/i18n/English/Shop.pm

@@ -908,6 +908,13 @@ our $I18N = {
 		lastUpdated => 1212550978,
 		context => q|Label for taking data out of the Shop (Tax, Product, etc.)|,
 	},
+
+    'import successful' => {
+        message => q|Your products have been imported.|,
+        lastUpdated => 1213047491,
+        context => q|Message telling the user the their products have been imported successfully.|
+    },
+
 };
 
 1;