initial commit to support GCE LB

add support targetPools, forwardingRules and httpHealthChecks API
add expectedTests and LiveTests for the above API
> this is interesting as it is how Google describe it 

Thanks for the link. From the Google doc, it seems as though the thing that you pass as a parameter is **not** a name, it's the actual instance URL. So our parameter name should not be `instanceName`, in that case?