Update Dockerfile to use stackbrew/ubuntu (until it graduates), update Dockerfile MAINTAINER line, coalesce all apt-get installs into one invocation (including s3cmd by bringing in backports)
Numerous small fixes to the CLI documentation
Merge pull request #3394 from jamtur01/clifixes

Numerous small fixes to the CLI documentation
Minor fixes to the basic command documentation
Merge pull request #3344 from tianon/dockerfile-cleanup

Many various Dockerfile cleanups
Merge pull request #3395 from jamtur01/basicsfixes

Minor fixes to the basic command documentation