support ssl certificate validation on python<=2.7.8
support ssl certificate validation on python<=2.7.8

That is, where ssl.CertificateError was not available yet.
https://github.com/httplib2/httplib2/issues/45

smurfix/httplib2,bearieq/httplib2,smurfix/httplib2,bearieq/httplib2,smurfix/httplib2,bearieq/httplib2