Update all tests to be compatible with requests-async
Cleanup testing client changes with black and isort
Remove Python 3.5 and other meta doc cleanup
rename pyproject and fix pep517 error
Add black config to tox.ini
Cleanup tests and remove aiohttp
tox.ini change for easier development commands
Remove aiohttp from changelog and requirements
Cleanup imports and Makefile
Allows for injection of the app object into the request object through
the request handler.
This allows for users to setup things like database connections etc. in
listeners and then utilize them throughout the their various route
handlers.
Usage is fairly simple like so:
```python
@app.get('/')
async def handler(request):
request.app.anything
```
Name is up in the air but I'll leave this up for a few days and I'll
change it if we get a consensus
