Summary: Use CircleCI 2.1 for common executors and remove the common build step as this is already done by Travis. Instead, focus on publishing either snapshots or releases. Pull Request resolved: https://github.com/facebook/flipper/pull/289 Reviewed By: jknoxville Differential Revision: D10216413 Pulled By: passy fbshipit-source-id: cfbc52c43187339ae6cb1c486d81e7c40216e86b