Add test coverage for construction of request body via `AFHTTPClient`. refs #989
Add test coverage around operation cancellation setting the error and invoking the failure block. refs #941
Pull in a few more basic request/response tests from @kcharwood
Add composite status code reporting during CLI execution
Merge branch 'feature/941-testing-infrastructure' of https://github.com/blakewatters/AFNetworking into tests

Conflicts:
	Tests/AFHTTPRequestOperationTest.m
Refactored Tests to contain a super class