Api v2

New names and organization for version 2 of the opentree api.

These changes depend on some recent db structural changes introduced by taxomachine (already merged to master) which will necessitate a db update for oti. I have pushed an updated database to devapi and re-indexed the studies there as well.

@jar398, @jimallman, would you review this?  
Is "is_deprecated" really a property? does it need an ot: namespace?