Merge pull request phpclassic#143 from n3o77/master

Make sure header keys are always lowercase

Merge branch 'apiVersion'

Merge pull request phpclassic#140 from zealnagar/master

Bug solved for previous link in ShopifyResounce

Next page url fix

Change testing country

Testing Error fix (Temporary)

[Fixes phpclassic#103] Move credentails to environment variables.

Count option is not available for Currency.

[Fixes phpclassic#47] Replace http_build_query with custom function

http_build_query in the method does URL-encoding to its components. While it may seem a logical thing to do, technically the string to be constructed is not a URL. Shopify doesn't do such encoding and as a result, the generated hash value does not match.

For example in the case when Shopify supplies protocol=http:// query parameter and current implementation with http_build_query encodes it to protocol=https%3A%2F%2F resulting in false negative result.

Merge pull request phpclassic#91 from phpclassic/v1.1

V1.1 - Merge to master