Also fixes a breaking change introduced between `representable` 2.3 and
3.0. Specifically, `:skip_undefined` is now be passed via the
`:user_options` option.
JSON has been part of the ruby stdlib since 1.9.0 (see
https://github.com/ruby/ruby/commit/af1c4167), and the latest version of
google-api-client requires ruby 2.0 or better so we can assume it's available
Sai Cheemalapati
Austin Wang
Steve Bazyl
James Healy
boshan
Steven Bazyl