Propose in this https://github.com/brancz/kubernetes-grafana/pull/78

* Avoid race condition when deploying quickstart example

The namespace and CRD creation must happen before any dependent objects
are created.  So we can put these in a separate directory (manifest/setup)
so they can be created before the other objects.

Some minor updates to the README and added a couple of scripts
for the quickstarts

Update travis script to avoid race condition

Signed-off-by: Paul Gier <pgier@redhat.com>

* simplify the example quickstart script and improve readme

Signed-off-by: Paul Gier <pgier@redhat.com>

* increase minikube memory to 6g for quickstart example

From the discussion brought up in this [issue](https://github.com/coreos/prometheus-operator/issues/2250), a new section has been added to the doc.

contrib/kube-prometheus: Add section on Prometheus Adapter requirements to README.md