Remove unnecessary sluggable requirement.
Remove unnecessary sluggable requirement.

SayIt now uses a PyPI source of mySociety's fork of django-sluggable
rather than VCS, which means it is automatically pulled in and installed
when you ask SayIt to be installed via pip. This will also be better if
at some point SayIt's version of django-sluggable should change.

ken-muturi/pombola,mysociety/pombola,geoffkilpin/pombola,geoffkilpin/pombola,mysociety/pombola,patricmutwiri/pombola,patricmutwiri/pombola,patricmutwiri/pombola,geoffkilpin/pombola,patricmutwiri/pombola,ken-muturi/pombola,mysociety/pombola,patricmutwiri/pombola,ken-muturi/pombola,geoffkilpin/pombola,mysociety/pombola,hzj123/56th,hzj123/56th,mysociety/pombola,ken-muturi/pombola,hzj123/56th,hzj123/56th,ken-muturi/pombola,patricmutwiri/pombola,mysociety/pombola,ken-muturi/pombola,geoffkilpin/pombola,hzj123/56th,hzj123/56th,geoffkilpin/pombola