How to setup a MongoDB replica set for the connector
You can start a single node replica set by starting the mongod with the replSet argument/config option, that is all that is required.  It takes a name argument, which will then function as the name of the replica set in question.  Once you have done that, you simply run rs.initiate() from the shell when connected to the node (this is only needed once).

This is described in detail here:

http://docs.mongodb.org/manual/tutorial/convert-standalone-to-replica-set/

To stay with just a single node, simply do not follow the "Expanding the set" instructions.