Add missing resources

@jduff @jeromecornet 

Some missing resources cause ActiveResource to break when caching and subsequently fetching an ActiveResource object.

```
ArgumentError: undefined class/module ShopifyAPI::Customer::DefaultAddress
ArgumentError: undefined class/module ShopifyAPI::Order::ClientDetails
```

```
activesupport-3.2.13/lib/active_support/cache.rb:587 → load
activesupport-3.2.13/lib/active_support/cache.rb:587 → value
activesupport-3.2.13/lib/active_support/cache.rb:294 → fetch
```