Change auto reloader enviroment varible name to SANIC_SERVER_RUNNING
Fix some typo mistakes, flake uncompatibilities and such problems.
Raise NotImplementedError for operating systems except posix systems for auto reloading.
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
