* 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

* [Modified] Makefile to run kustomize.jsonnet
* [Modified] Moved kustomization from example.jsonnet to
examples/kustomize.jsonnet
* [Modified] kustomization file to land at root of kube-prometheus so
current users can continue to use `kubectl apply -f manifests`

Closes #2391

Adds support to allow kustomize users to point to a [remote
base](https://github.com/kubernetes-sigs/kustomize/blob/master/examples/remoteBuild.md) of the prometheus-operator and kube-prometheus. Now that kustomize is a part of kubectl, this is provides a very simple way of installing prometheus-operator and kube-prometheus with no additional tools besides kubectl.

* [Added] kustomization.yaml: hardcoded kustomization base for prometheus-operator
bundle.yaml
* [Added] kustomization generation from kube-prometheus example jsonnet

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