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?  
@chinchliff: Oddly, I'm getting an error on exactly one study, **pg_719** (all the others are indexed properly):
```
Indexing http://devapi.opentreeoflife.org/api/ study pg_719 from http://devapi.opentreeoflife.org/api/default/v1/study/pg_719.json
Calling "http://devapi.opentreeoflife.org/oti/ext/studies/graphdb/index_studies" with data="{'urls': ['http://devapi.opentreeoflife.org/api/default/v1/study/pg_719.json']}"

Indexing failed for URL "http://devapi.opentreeoflife.org/api/default/v1/study/pg_719.json", study http://devapi.opentreeoflife.org/api/default/v1/study/pg_719.json. Message = "More than one hit found for ot:studyId == 719. The database is probably corrupt."
```
Any chance this is confused by the presence of another "719" study? But I don't see a **ot_719**... at least not in the GitHub repo (will check the API server's "local" repo next).