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.