Tomodachi

- Fixes an issue affecting websocket connections where the receive function was invalidly called twice of which one time were without error handling.

- Solves an error with functions for AMQP / AWS SNS+SQS functions that are used without a message_protocol class.
- Improved disconnect and reconnect to AWS SNS+SQS via aiobotocore on hot-reload and during testing.
- Improved README with event based messaging example using AMQP.
- Added the option of running `schedule` tasks immediately on service start. For example a function decorated by `schedule(interval=20, immediately=True)` would be run immediately on service start and then every 20 seconds.

- Improved error handling for bad requests (error 400) on HTTP calls.
- File watcher for hot-reload now excludes ignored directories in a more effective way to ease CPU load and for faster boot time for projects with thousands of files which should've been ignored.

- `schedule` functions limits to 20 running tasks of the same function to prevent overflows in development.
- Fixes an issue where `schedule` tasks stopped executing if a service was hot-reloaded on code change.
- Handles websocket cancellations better if the client would close the connection before the request had been upgraded.

- Updated to use `aiohttp` 3.X.X+ and `aiobotocore` 0.6.X+.
- Dropped support for Python versions below 3.5.3 as new `aiohttp` requires at least Python 3.5.3. Last version with support for Python 3.5.0, 3.5.1 and 3.5.2 is `tomodachi` `0.8.X` series.

- Print stack trace for outputs from `schedule` invoker functions tasks instead of silently catching exceptions.
- Handle close and receive errors for websockets and cleanly close already opened websockets on service exit.