Changes
ENHANCEMENTS
* Add connection information to cursor exceptions, see
MongoCursorException::getHost.
* Allow metadata to be sent using MongoGridFS::storeUpload.
* Connections are now fork-safe.
* Removed username/password from connection URI parse exception message.
* Slight optimization of receiving database responses.
BUG FIXES
* Fixed replica set master determination with authentication enabled (which
would cause "invalid command" errors and segmentation faults).