Update to stable futures (#77)

* Update to stable futures

* Fix breaking hyper and tokio changes

* Fix breaking soketto changes

* Try to fix hyper update errors

* Fix remaining hyper compilation error

* Update futures timer

* Update to tokio 0.2

* Enable basic_scheduler

* Enable logging in example

* Bind server inside runtime context

* Format code

* Return error via channel if async server bind fails

* Apply suggestions from code review

Co-Authored-By: Pierre Krieger <[email protected]>

* Question mark

Co-authored-by: Pierre Krieger <[email protected]>