added callbacks for custom meteor methods
cleaned up notification for meteor method
returning method id
removed method id when result received
ensure that custom methods get trapped, incase data is non-object like boolean...  also, initialized methodIds
Add test coverage for https://github.com/boundsj/ObjectiveDDP/pull/33
Refactor https://github.com/boundsj/ObjectiveDDP/pull/33 to use set instead of NSDictionary