JSON-C needs to be 0.11 or higher due to dependency on json_object_iter_*

JSON-C needs to be 0.11 or higher due to dependency on json_object_iter_* See http://upstream-tracker.org/compat_reports/json-c/0.10.20120530_to_0.11.20130402/abi_compat_report.html. URL has also changed for homepage of JSON-C