Support ciphers SSLOptions setting across adapters

Would you be open to me contributing a `#clear` method in `Faraday::Adapter::Test::Stubs`?

Please revisit the comma separated header collapsing decision.

Faraday Adapter Parallel Requests On Multiple Domains / Connections

Distinguish TimeoutErrors for open and read timeouts

faraday does not support ipv6 in URL

Requests can no longer be converted to simple JSON

Retain additional adapter information (timing, timeout, etc)