Update pushbullet.py

fix pushbullet notif errors/stop working
source : http://www.nicholasoverstreet.com/2014/07/fix-sickbeard-pushbullet-notification-failed-error/
Merge pull request #280 from xila76/patch-1

Update pushbullet.py
Merge pull request #281 from sarakha63/development

pushbullet V2 update