Add former politicians and member counts to place detail context
Add former politicians and member counts to place detail context

We'll use this in the place detail template to render up to 5 different
lists and up to 3 people counts.

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