Make order.rb and shipping_address.rb to take both symbol and string key for params.
Order.new now take basic param and shipping params; update order_xml_build.rb order_item.rb
due to walmart xsd changes; add first_name, last_name, phone field to shipping_address.
Update readme with new order param changes and order_item param changes.
Manual merge with master

Merge branch 'master' into order_params

Conflicts:
	lib/walmart_open/shipping_address.rb
	spec/walmart_open/order_spec.rb
	spec/walmart_open/shipping_address_spec.rb
Add accept string key param test cases to order_spec.rb and shipping_address_spec.rb
Update spec to improve readability.
Merge pull request #7 from xlu/order_params

Order param now take basic params and shipping params, updates made based on walmart xdd changes.
Make quanity an actual argument
Check for empty strings
Bump to 0.0.4
Add special feed api.
Fix README.md for special feeds.
Improve feed_spec.rb.
Merge pull request #9 from xlu/special_feeds

Add special feed api.
Change Feed request API slightly, update specs
Update readme
Change AuthenticationError to ServerError in base requests

Fixes #8
Bump dependency webmock gem version
Bump version to 0.0.5
Make walmart special feed query to return walmart_item instead of attribute hashes.