* Make connection failures visible in Ruby SDK
The underlying HTTP library, Typhoeus, requires you to be explicit about
error handling. Unfortunately, this also means that we can't assume that
`response.success?` will be false only when the HTTP status code is not
a 200; it could also be false when the request fails (timeouts, TLS
verification issues, etc.). This commit adds explicit error handling for
these cases.
* Update samples