Modified faraday connection to request with a json payload.
Extending of Gateway for Issuers is not needed.
When cardgate http response it not between 200 and 299 raise an exception.
Moved issuers test to test/ideal.
Updated the rake file test task to include tests within subfolders.
Added the source for deep_merge from rails, only load when rails is not defined.
Created a payment class with the iDeal payment implementation.