OpenSteam 0.9.3

OpenSteam is a web-based shopping and e-commerce framework for RubyOnRails.
OpenSteam features generators, as known from Rails, to easily create webshops and products with one command.
With OpenSteam it is possible to associate products with various properties, to create multiple product-models, and to give specific product-configurations an inventory-entry (price, storage, etc).

Main features:>
- generator to create webshops
- generators to create products and properties
- Shopping Cart
- Checkout-Workflow
- Associate Products to Properties
- Define price and storage-quantity for products or specific product-configurations
- Admin-Backend to overview customers and orders.
- Taxes: define taxes or tax-groups for products and regions
- ActiveMerchant Integration (CreditCard Payment)
- PaymentMethods: use the implemented creditcard payment or simply implement your own payment-method
- ShippingRate: define rates for products, regions and payment-types, or implement your own shipping-rate calculation
- PDF-Export for invoices (using the excellent prawnto plugin)
- Rails 2.1.1 compatibility.

System requirements:
- RubyOnRails

Enhancements:
- added a ContainerModel to hold the basic ShoppingCart Logic (add/update/delete items, increment/decrement), STI
- moved Cart from session to database (into Container)
- moved OrderBase into Container (same logic as ShoppingCart)
- added a Tax-System (TaxZones, TaxGroups, Calculation, etc), MVC
- implemented ActiveMerchant Integration. (CreditCard Payment)
- added PaymentTypes and a Payment Base Class to simplify future integration of payment-methods
- added ShippingRate calculation (ShippingRates, Zones, ShippingRateGroups), MVC
- added shipping-rates, taxes, netto_price calculation, payment_type to OrderBase (Container)
- refactored Checkout-Process and OrderBase-Model in order to work with payment_type, shipping-rate and taxes
- added PDF-Export for Invoices (using the prawn-gem and prawnto-plugin http://www.cracklabs.com/prawnto )
- removed state-logic from InvoiceBase (not needed)
- added payment_process initializers (CreditCardPayment)
- added Configuration Model (Backend), to hold simple key-value pairs
- added units tests for Container::Base (Order, Cart), Payment, ProductBase and Order
- refactored the "set_properties=" method in ProductBase. Now "building" the inventory-objects instead of creating.
- refactored the _attributes partial for products in order to work with the new "set_properties=" method.
- InventoryBase: added a named_scope called :by_properties (replaces the exists_by_properties extension-method fpr the inventories-association in ProductBase): Now: Single SQL-Query instead of fetching every single property.
- fixed bug in StateMachine caused by inheritance: declared observers and inialstate as class_inheritable_accessor
- StateLogic: changed state-name from .downcase to .underscore
- deleted unnecessary partials (TODO: more to delete!)
- renamed cart_controller to carts_controller (ActiveRecord Model, recources!)
- added a "init_opensteam_config" migration file, to create admin-uses and load fixtures (zones, tax_zones, shipping_rates, configuration)
- added verification_value to credit_card_payment partials
- deleted lib/cart_base.rb (not needed anymore, now Opensteam::Cart < Opensteam::Container::Base)