bug(procfile): validate the procfile process name does not contain capital letters

[lachie83]

Very similar to this issue although we need to check for capitals.
deis/workflow-cli#247
https://github.com/deis/controller/pull/1105/files

Need to validate procfile naming complies with Kubernetes deployment naming restrictions. Creating a proc called thisisaTest yields the following error message and breaks the app.

ERROR (app::deploy): (app::deploy): ('failed to create Deployment "namespace-thisisaTest" in Namespace "pickle": 422 Unprocessable Entity Deployment.extensions "namespace-thisisaTest" is invalid: [metadata.name: Invalid value: "namespace-thisisaTest": must match the regex [a-z0-9]([-a-z0-9]*[a-z0-9])?(\\.[a-z0-9]([-a-z0-9]*[a-z0-9])?)* (e.g. \'example.com\'), spec.template.spec.containers[0].name: Invalid value: "namespace-thisisaTest": must match the regex [a-z0-9]([-a-z0-9]*[a-z0-9])? (e.g. \'my-name\' or \'123-abc\')]', 'namespace-thisisaTest, 'pickle')