Fix upstream issue to support array of strings in attributes.

Fixes issue #13
Release v1.0.6
Declare mixins used by resource on class declaration.

Previously they were dynamically added to the base class, which makes the
code harder to read.
Fix thread local headers to store a copy of the default hash.

This was resulting in active_session in one thread causing the access token
to be modified in all thread, since the same headers hash was used despite
being assigned to a thread-local variable.
Release v1.0.7
Add _prefix classmethod to Article resource handling blog_id presence or absence same as the Variant resource does for product_id
Merge pull request #17 from sinejoe/master

Allow article lookup by ID without the blog_id requirement
added support for CustomerSavedSearches
removed comments in the code which could fall out of date with the api
Merge pull request #22 from Shopify/customer_saved_search

added support for CustomerSavedSearches
updated session.py to better match the ShopifyAPI ruby gem and updated the readme
re-did the request_token method and updated the readme
made create_permission_url an instance method and updated the readme
Merge pull request #23 from Shopify/updating_readme_and_session

updated session.py to better match the ShopifyAPI ruby gem and updated t...
updated to the new pyactiveresource, removed duplicate code that is in pyactive resource, updated changelog
Merge pull request #24 from Shopify/new_pyactiveresource

updated to the new pyactiveresource
refactored resources.py into a module
started to port the tests from the api gem. Added tests for article abd added 2 missing methods for article
added tests for blog, also commiing the fixtures now
added cart resource and cart test