Should consider adding :verify_ssl parameter

[keremoge]

If consumer doesn't want to verify the ssl cert, for now there is no way to disable ssl cert control.
To make it possible there should be a :verify_ssl parameter in RestClient

Sample ssl error:
SSL_connect returned=1 errno=0 state=SSLv3 read server certificate B: certificate verify failed (RestClient::SSLCertificateNotVerified)