add docstrings, remove old functions
pull discover_csv off to separate function
Merge remote-tracking branch 'cpcloud/mrocklin-csv-pandas-fixes' into csv-pandas-fixes
minor fixes around csv -> pandas
Merge remote-tracking branch 'mrocklin/csv-pandas-fixes' into mrocklin-csv-pandas-fixes
csv no longer pessimistic about option types
Merge remote-tracking branch 'mrocklin/csv-pandas-fixes' into mrocklin-csv-pandas-fixes
into mongo <- csv is smarter about option types
Merge remote-tracking branch 'mrocklin/csv-pandas-fixes' into mrocklin-csv-pandas-fixes