First pass at volume tutorial.
Correct application name.
Custom docker image so MongoDB doesn't require 3GB disk space.
Formatting fixes.
Switch to new image in all configuration.
Match the volume point within dockerfile/mongodb.
Merge remote-tracking branch 'refs/remotes/origin/master' into eppur-si-muove-tutorial-131
Make mongodb-tutorial image start mongod with data path matching the volume.
Merge remote-tracking branch 'refs/remotes/origin/master' into eppur-si-muove-tutorial-131
restart docker to ensure that it gets the correct tmpdir configuration
A link to the streamlined mongo image ticket and write to /var/tmp instead of /tmp
Merge pull request #411 from ClusterHQ/eppur-si-muove-tutorial-131

Volume moving tutorial

Author: @itamarst 
Reviewer: @wallrj

Fixes #131