Travis: Also test on Ruby 2.0.0.
Travis: Also test on Ruby 2.0.0.

(cherry picked from commit 080b862aa221641c02fd7a6c79d4c6c7b2b977a9)

oneclickorgs/one-click-orgs,oneclickorgs/one-click-orgs,oneclickorgs/one-click-orgs-deployment,oneclickorgs/one-click-orgs,oneclickorgs/one-click-orgs,oneclickorgs/one-click-orgs-deployment,oneclickorgs/one-click-orgs-deployment