Fixed PHP-831 and PHP-832: Add support for SASL authentication (Kerberos and PLAIN)
Fixed PHP-845: Ability to use different SPN on the driver for Kerberos Authentication
Fixed PHP-844: driver must authenticate before calling isMaster()
Add authentication capabailities into phpinfo()
Update the placeholder for the gssapi principle name to gssapiServiceName
Merged Pull Request #469

* pull-request/469:
  Update the placeholder for the gssapi principle name to gssapiServiceName
  Add authentication capabailities into phpinfo()
  Fixed PHP-844: driver must authenticate before calling isMaster()
  Fixed PHP-845: Ability to use different SPN on the driver for Kerberos Authentication
  Fixed PHP-831 and PHP-832: Add support for SASL authentication (Kerberos and PLAIN)