Determine whether special filters necessary, and re-implement some if still desired

[mileswwatkins]

These implementations are currently broken. If they're determined to be necessary, they need to be re-implemented. Otherwise, they should be removed from the docs.

• person search
  • [ ] member_of
  • [ ] ever_member_of
• bill search
  • [ ] chamber
  • [ ] session
  • [ ] jurisdiction_id
• vote search
  • [ ] jurisdiction_id
  • [ ] chamber
  • [ ] session
• event search
  • [ ] jurisdiction_id
  • [ ] participants_id
• all objects
  • [ ] external IDs

[fgregg]

+1 for member_of I could really use that.

event search, jurisdiction_id seems like it does work.