Add service hook for Distiller

Distiller is a Continuous Integration and Deployment service for iOS.

http://distiller.io
Add Distiller help text
Update Distiller hook to use HttpPost as parent class
Fixing typeo and bug in static file selector.
Add DjangoPackages Service.
Fix Distiller support URLs
Merge pull request #852 from jmervine/master

Fixing type-o and bug in static file selector.
Merge branch 'add-django-packages' of https://github.com/opencomparison/github-services into opencomparison-add-django-packages
remove explicit port mention
make tests reflect reality
Merge pull request #839 from travis/distiller

Add service hook for Distiller