This solves #68 (currently closed) and allows product searches to function in spree_promo

By manually defining the routes for admin_product_product_packages the search problem inside spree_promo is fixed. This also removes the duplicate route problem associated with using the resources macro in the route definition. The one downside is a more terse routes.rb file.

The following screenshot demonstrates the duplicate route situation I am referring to:
![screen shot 2013-05-30 at 10 27 07 am](https://f.cloud.github.com/assets/64573/585800/3c914f7e-c93e-11e2-9539-c8df784c6af5.jpg)