Update member fixtures with real data
Extract helper
Show date member left office
Make method more concise
Match PHP sorting of policies

I stuffed this up in 85c39184948a3bb29c22af474d121a918d23d0eb
Handle situations where @member and @members are both populated. Eugh
Add some nasty hacks to display what parliament we show stats for

This matches PHP but is probably wrong. Surely it's not just for the
first parliament they joined, right?
Extract Parliaments into its own model
Extract method and clarify comments
Combine templates. So DRY, much code reduction, wow
Remove unnecessary method