Create PHP library to provide helpers for administrative Mongo commands

On the subject of creating additional helpers for administrative commands, > I think that's ripe for a new library. I don't see any reason that needs to be implemented in C, since the overheard of having a pure-PHP library implement these wrappers would be so small.

This library could be constructed with an existing Mongo or MongoDB instance, and then provide methods for various Mongo administrative commands, which proxy the runCommand() method of the driver.