Use the rootUrl of the api meta instead of the hardcoded googleapis.com.
This allow any Google cloud endpoints to be used.
Merge pull request #72 from rakyll/query-params-fix

0.4.0 ignores query params
Releasing 0.4.1.
handle cases where the rootUrl is not pass and use the googleapis.com as default.
Merge pull request #71 from shakkame/master

Allow any Google cloud endpoint to be used