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
pushbullet plugin: cleaned up error handling output
pushbullet plugin: changed log.debug for 500 response status to log.warning
pushbullet plugin: tweaked positioning of output and declaration of
loop-specific (title and body) vs pushbullet (api_key, device_iden, type) options
Merge pull request #229 from mingtang/develop

Pushbullet Plugin

Thank you for the contribution @mingtang =)