Upgrade django-pipeline, to avoid RemovedInDjango19Warning
Upgrade django-pipeline, to avoid RemovedInDjango19Warning

mastizada/pontoon,vivekanand1101/pontoon,sudheesh001/pontoon,sudheesh001/pontoon,vivekanand1101/pontoon,participedia/pontoon,mastizada/pontoon,m8ttyB/pontoon,mastizada/pontoon,Jobava/mirror-pontoon,m8ttyB/pontoon,vivekanand1101/pontoon,vivekanand1101/pontoon,participedia/pontoon,sudheesh001/pontoon,participedia/pontoon,jotes/pontoon,jotes/pontoon,yfdyh000/pontoon,mathjazz/pontoon,mathjazz/pontoon,mathjazz/pontoon,jotes/pontoon,yfdyh000/pontoon,mozilla/pontoon,yfdyh000/pontoon,Osmose/pontoon,mathjazz/pontoon,mathjazz/pontoon,mastizada/pontoon,m8ttyB/pontoon,participedia/pontoon,mozilla/pontoon,mozilla/pontoon,Osmose/pontoon,Osmose/pontoon,yfdyh000/pontoon,mozilla/pontoon,m8ttyB/pontoon,Jobava/mirror-pontoon,Osmose/pontoon,Jobava/mirror-pontoon,sudheesh001/pontoon,Jobava/mirror-pontoon,jotes/pontoon,mozilla/pontoon