App-server

- disabled custom logging

- added task emulator
- added cron emulator
- added storage emulator
- changed host from localhost to 0.0.0.0
- added custom logging

- disabled custom logger

- disabled gRPC fork support
- increased default timeout to 60 Sesconds

- we now reuse gunicorn porn
- added timeout till 502 error

- clean up entire source
- dropping of several functions, to make the source code easier to read
- Improved PEP8-conformity
- Check on runtime version and correct Python version
- Use entrypoint from app.yaml, with additional variables