Minor README refactors
Added /lists/list path
Added /lists/members path
Added /lists/members/show
Added /lists/memberships
Added /lists/ownerships path
Added extra validation step that isn't possible to pass under non-slug branch
Added /lists/show path
Added /lists/statuses
Added /lists/subscriptions path
Added /lists/subscribers/

Inconsistent 404. May be Twit bug, need to test more
Added /lists/subscribers/show path

Had the same itermitent 404 problem as subscribes