pushbullet output plugin

Example:

  pushbullet:
    apikey: <API_KEY>
    device: <DEVICE_IDEN>
    [title: <MESSAGE_TITLE>] (default: "{{task}} - Download started" -- accepts Jinja2)
    [body: <MESSAGE_BODY>] (default: "{{series_name}} {{series_id}}" -- accepts Jinja2)
pushbullet plugin: updated default title