Time2relax

- Drop Python 2.7 support - Python 2.7 will not be maintained past 2020.

- Move the time2relax API to `time2relax.time2relax`.
- Add Python 3.7 support.

- Fix Travis build errors - invalid config

- `CouchDBError` is now `HTTPError` (*Backwards Incompatible*)
- `CouchDB(skip_setup=False)` is now `CouchDB(create_db=True)` (*Backwards Incompatible*)
- Add Python 3.6 support.
- Drop Python 2.6 support - Python 2.6 is no longer supported by the Python core team. (*Backwards Incompatible*)

- New time2relax API. (*Backwards Incompatible*)
- time2relax is now a thin `requests` wrapper.
- New design document functions; `list`, `show`, `view`.

- Add Python 3.3, 3.4, 3.5 support.