Add Riak and kernel tuning.
Replace supervisord with boot.sh.
Replace Pipework with Docker 0.6.5+ container linking.
Explicitly use Ubuntu 12.04 as the base image.
Install Riak via a direct download.
Make Riak configuration changes a one-liner.
Make dependency installation a one-liner.
Standardize Makefile.
Update test-cluster command to member-status.
Update README.
Update CHANGELOG.