Factor out SlugRedirect-based slug redirection into a mixin
Factor out SlugRedirect-based slug redirection into a mixin

We'd like to be able to reuse this code to provide slug redirection
for other DetailView-derived views, based on their 'model' class
attribute.

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