add /congress/members/<govtrack_id>

In the congress-legislators repo, the legislators YAML includes a govtrack id. However, govtrack doesn't currently serve this URL even though it uniquely identifies the congressperson. It's unideal to have to try to reconstruct something like http://www.govtrack.us/congress/members/max_baucus/300005 rather than just http://www.govtrack.us/congress/members/300005 . What do you think?