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?  
In case it helps, the [error message seems to be coming from **ot-base**](https://github.com/OpenTreeOfLife/ot-base/blob/9c0352af452518de3a3e1e17a96ad0bbd959934e/src/main/java/org/opentree/graphdb/DatabaseUtils.java#L115).