fix(coreos): tune etcd to address high disk i/o environments
fix(builder): limit cpu shares to 800
fix(controller): use /runner/init entrypoint only on procfile

When a dockerfile and a Procfile are present, the default entrypoint
should be /bin/bash instead of /runner/init, which is the default
entrypoint for Procfile-based applications.
ref(controller): use /bin/sh for better portability

This allows us to run admin commands on micro-images such as busybox.
docs(deisctl): add examples and sshPrivateKey=path to config usage
Merge pull request #2648 from mboersma/docs-sshpkey-is-path

docs(deisctl): add examples and sshPrivateKey=path to config usage
docs(managing_deis): provide login instructions

Add a page to the docs to explictly define how to connect to a
cluster.
docs(managing_deis): recommend wildcard CNAME or Route53 for EC2 DNS
feat(*): provision using CoreOS stable channel
Merge pull request #2646 from mboersma/coreos-stable

feat(*): provision using CoreOS stable channel
Merge pull request #2643 from gabrtv/etcd-fixes

Tune etcd to address timeouts and builder issues
Merge pull request #2649 from mboersma/login-instructions

docs(managing_deis): provide login instructions
Merge pull request #2642 from bacongobbler/fix-entrypoint

fix(controller): dockerfile entrypoint should use /bin/sh
ref(tests): switch to example-dockerfile-http app

This application's final image size is significantly smaller than
example-go's, which should dramatically increase integration test times:

    REPOSITORY                                    TAG                 IMAGE ID            CREATED             VIRTUAL SIZE
    10.132.162.4:5000/example-go                  v2                  363636be7289        3 minutes ago       957.1 MB
    10.132.162.4:5000/example-dockerfile-http     v2                  6b7c19477ae5        49 minutes ago      2.433 MB
Merge pull request #2634 from bacongobbler/minimal-app-test

ref(tests): switch to example-dockerfile-http app
Merge pull request #2651 from mboersma/cname-for-ec2

docs(managing_deis): recommend wildcard CNAME or Route53 for EC2 DNS