Allow loading file from http

examples/loadHttp.md

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+# load file from http
+
+Resource and patch files could be loaded from http
+
+<!-- @loadHttp -->
+```sh
+DEMO_HOME=$(mktemp -d)
+
+cat <<EOF >$DEMO_HOME/kustomization.yaml
+resources:
+- https://raw.githubusercontent.com/kubernetes-sigs/kustomize/master/examples/helloWorld/configMap.yaml
+EOF
+```
+
+<!-- @loadHttp -->
+```sh
+test 1 == \
+  $(kustomize build $DEMO_HOME | grep "Good Morning!" | wc -l); \
+  echo $?
+```
+
+Kustomize will try loading resource as a file either from local or http. If it
+fails, try to load it as a directory or git repository.
+
+Http load applies to patches as well. See full example in [loadHttp](loadHttp/).

examples/loadHttp/kustomization.yaml

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+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+resources:
+- https://raw.githubusercontent.com/kubernetes-sigs/kustomize/master/examples/wordpress/wordpress/deployment.yaml
+- https://github.com/knative/serving/releases/download/v0.12.0/serving.yaml # redirects to s3
+patches:
+- https://raw.githubusercontent.com/kubernetes-sigs/kustomize/master/examples/wordpress/patch.yaml
+patchesStrategicMerge:
+- |-
+  apiVersion: rbac.authorization.k8s.io/v1
+  kind: RoleBinding
+  metadata:
+    name: custom-metrics-auth-reader
+    namespace: kube-system
+  $patch: delete