Upgrade excon to version 0.28.x
Require SSLv3 to workaround intermittent SSL connection issues (needs excon version 0.28.x)
Add retries for idempotent methods (requires excon 0.17+)
Merge pull request #27 from mortardata/ddaniels_upgrade_excon

[#60194954] Upgrade excon to use SSLv3 fix and idempotent requests with retries