Adding Boxcar2 support

Adding Boxcar2 support from commit :
https://github.com/midgetspy/Sick-Beard/commit/d4df00267ddedaed5ee8ce417944be6559700b7a

Fichier configNotfications.js très en retard, à update dans un prochain
commit.

Ignore sickbeard/notifiers/growl.py
Ignore sickbeard/notifiers/nma.py
Ignore sickbeard/notifiers/prowl.py
Ignore sickbeard/notifiers/pushover.py
Ignore sickbeard/notifiers/trakt.py
Merge pull request #294 from LittleLama/development

Adding Boxcar2 support