docs(managing_deis): recommend wildcard CNAME or Route53 for EC2 DNS
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
Revert "ref(controller): use /bin/sh for better portability"

This reverts commit a897ddb2aba0dbc2068599a9263a21077f13679c.
Revert "ref(tests): switch to example-dockerfile-http app"

This reverts commit d4b9ca897f5535733cd89daac08ec61baf0d1f20.