Fixed PHP-657: Deprecate MongoCursor::slaveOkay
Remove the leftover 'fd' property that was killed recently (in 1.4)

See PHP-794
Fix tests
Merged Pull Request #428

* pull-request/428:
  Fix tests
  Remove the leftover 'fd' property that was killed recently (in 1.4)
  Fixed PHP-657: Deprecate MongoCursor::slaveOkay