Add redis chart example

examples/charts/redis/Chart.yaml

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+name: redis
+description: Port of the replicatedservice template from kubernetes/charts
+version: "2"
+home: ""
+expander:
+  name: Expandybird
+  entrypoint: templates/redis.jinja

examples/charts/redis/templates/redis.jinja

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+{% set REDIS_PORT = 6379 %}
+{% set WORKERS = properties['workers'] if properties and properties['workers'] else 2 %}
+
+resources:
+- name: redis-master
+  type: gs://kubernetes-charts-testing/replicatedservice-3.tgz
+  properties:
+    # This has to be overwritten since service names are hard coded in the code
+    service_name: redis-master
+    service_port: {{ REDIS_PORT }}
+    target_port: {{ REDIS_PORT }}
+    container_port: {{ REDIS_PORT }}
+    replicas: 1
+    container_name: master
+    image: redis
+
+- name: redis-slave
+  type: gs://kubernetes-charts-testing/replicatedservice-3.tgz
+  properties:
+    # This has to be overwritten since service names are hard coded in the code
+    service_name: redis-slave
+    service_port: {{ REDIS_PORT }}
+    container_port: {{ REDIS_PORT }}
+    replicas: {{ WORKERS }}
+    container_name: worker
+    image: kubernetes/redis-slave:v2
+    # An example of how to specify env variables.
+    env:
+    - name: GET_HOSTS_FROM
+      value: env
+    - name: REDIS_MASTER_SERVICE_HOST
+      value: redis-master

examples/charts/redis/templates/redis.jinja.schema

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+info:
+  title: Redis cluster
+  description: Defines a redis cluster, using a single replica
+    replicatedservice for master and replicatedservice for workers.
+
+properties:
+  workers:
+    type: int
+    default: 2
+    description: Number of worker replicas.