Add the tracking identifier to the error message, so that we can track the logs and see what happened when someone gets this error.
Add support for signature.privatekey for saml-sp-remote
Merge branch 'feature/short-sso-trackid'

* feature/short-sso-trackid:
  Add the tracking identifier to the error message, so that we can track the logs and see what happened when someone gets this error.
Merge branch 'spremote-privatekey' of https://github.com/dtsosie/simplesamlphp into dtsosie-spremote-privatekey
Formatting.
Merge branch 'dtsosie-spremote-privatekey'