starting a roll call votes parser, including some refactoring of existing code so it can be reused
more on vote parsing
replace the submodule with scripted clone/pull, which makes it easier to always be at the latest upstream commit and lets us control the clone depth
make vote XML output closer to GovTrack
refactoring mistake
--congress flag was broken
documented roll call votes parser in the README
revised vote IDs to use canonical session years (e.g. 2012) rather than session ordinals (e.g. 1, 2)
1) fix how congress-legislators repo is updated; 2) in the votes parser change the meaning of --force and add new option --fetch