Using last version of mongo to avoid assertion: 17369

[earthquakesan]

Had an error: assertion: 17369 Backing up users and roles is only supported for clusters with auth schema versions 1 or 3, found: 5 explanation can be found here: http://stackoverflow.com/questions/27664250/mongodump-assertion-17369

Changed Dockerfile to use last version of mongo (which I use in production in my project).

Also added a script for quick test of the docker container

Thanks for sharing your work! -)