Allow jxn config to determine whether/what bills get dropped during import.
Cache votes to avoid dupes.
Allows jxns to specify which bills get dropped
Caches orgs for later use in adding memberships
Uses cached orgs when adding memberships
Lets jxn config determine whether to add memberships during people scrape
Update base config to support caching of orgs
NYC: classify motion text
SF and philly config tweaks
Caches config objects, so that caching of orgs is possible