New service calls and sensors for shopping list component

Feature Requests
15

Why not make an command line sensor? This is working in docker also.

sensor:    
  - platform: command_line
    name: shopping_list
    command: /config/shopping_list.py

shopping_list.py:
#!/usr/local/bin/python
# coding: utf8
import json

with open('/config/.shopping_list.json') as data_file:
    shoppingListData = json.load(data_file)

content = u"Boodschappen:\n"
for entry in shoppingListData:
    if not entry['complete']:
        content += u"- %s\n" % entry['name']

content += u"\n"

print(content)

Then this is possible:

trigger:
  platform: zone
  zone: zone.shop
  event: enter
action:
  service: notify.telegram
  data_template:
    message: '{{states.sensor.shopping_list.state}}'
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