Summary:
This PR sets up Circle CI to publish pods when github release is made. This PR also updates the Flipper-Folly pod as it didn't build on 32 bit architecture, because `thread_local` was not supported.
Automated publish of cocoapods through Circle CI.
Pull Request resolved: https://github.com/facebook/flipper/pull/445
Reviewed By: danielbuechele
Differential Revision: D15333975
Pulled By: priteshrnandgaonkar
fbshipit-source-id: 7db68efeeebbe344213917f10f9f3ce4132e8cbc
07f327f46b