Node-red-node-mongodb should use a database-Parameter on "mongo in" and "mongo out"

On my Project I need to get destination database from http-request. For example I get the withoud port as database name. So the same Application can use different data on different domains.
For that I modified Version 0.2.5 to implement that. This working implementation I commited on github Merge 10a2aa610ebb24d4a29723c9c5b5252f1d02d39a into bb6491942ea3b1acc… · node-red/node-red-nodes@939b659 · GitHub

What du you mean, should this be pulled to master or sould I change or extend something?

By that way, are there other changes I should implement to that small module?
