AuthNetCim conf to let developer get generated errors such as declines.

I hit my head against the wall a weekend trying to generate a declined transaction. I was following AuthNet error generation (guide)[http://www.authorize.net/files/ErrorGenerationGuide.pdf] and seemed not to work.

The _problem_ is that the gateway will send requests with the x_test flag as true if you passed ```test: true``` at creation. In order to generate failed transactions and such, this flag shouldn't be set.

Here is forum that exposes the (problem)[http://community.developer.authorize.net/t5/Integration-and-Testing/CIM-Using-test-mode-to-generate-specific-transaction-results-not/m-p/35033] too.