fdsys mirror: correct some command-line arg bugs
update README: add fdsys/bill_versions scrapers, remove info on the github hosted download files which no longer exist
Added a known users section to README
Merge branch 'master' of github.com:unitedstates/congress
Merge pull request #43 from GPHemsley/historical-bills-1951

Add source information for statutes-derived data
Support related amendments, fix some related bill reason parsing
Merge branch 'master' of github.com:unitedstates/congress
Change bill_versions expected metadata output
parsing raw text of nomination into fields
Merge remote branch 'origin/master'
Added error catching for split nomination ids