Wit

- Fixed request keyword arguments issue
- Better error messages

- Added `examples/template.py`
- Fixed missing type
- Updated `examples/weather.py` to `examples/quickstart.py` to reflect the docs

Bot Engine integration

breaking

- the `message` API is wrapped around a `Wit` class, and doesn't take the token as first parameter

Rewrite in pure Python

breaking

- audio recording and streaming have been removed because:
- many people only needed access to the HTTP API, and audio recording did not make sense for server-side use cases
- dependent on platform, choice best left to developers
- forced us to maintain native bindings as opposed to a pure Pythonic library
- we renamed the functions to match the HTTP API more closely
- `.text_query(string, access_token)` becomes `.message(access_token, string)`
- all functions now return a Python dict instead of a JSON string