Allow more characters (particulary '.') in election IDs when generating diffs
Allow more characters (particulary '.') in election IDs when generating diffs

mysociety/yournextrepresentative,DemocracyClub/yournextrepresentative,neavouli/yournextrepresentative,neavouli/yournextrepresentative,mysociety/yournextrepresentative,DemocracyClub/yournextrepresentative,mysociety/yournextmp-popit,mysociety/yournextrepresentative,mysociety/yournextmp-popit,mysociety/yournextmp-popit,mysociety/yournextrepresentative,neavouli/yournextrepresentative,neavouli/yournextrepresentative,mysociety/yournextmp-popit,mysociety/yournextrepresentative,neavouli/yournextrepresentative,DemocracyClub/yournextrepresentative,mysociety/yournextmp-popit