updated RKResponseDescriptor and migrated tests to SenTestCases
fixed issue with git submodule not pointing to public URL
fixed ternary statements and project file
changed cibuild to use bundle
Revert "changed cibuild to use bundle"

This reverts commit 414977f77a9d43a83e56d04a3504d395fbba422e.
Merge remote-tracking branch 'origin/experimental/rkresponse-descriptor' into experimental/port-to-afnetworking-2.0
Fix serialization breakage