How to make `SQLAlchemy` in `Tornado` to be `async` ?
I found example for MongoDB on [async mongo example](http://emptysquare.net/blog/refactoring-tornado-code-with-gen-engine/) but I couldn't find anything like `motor` for `SQLAlchemy`. Does anyone know how to make `SQLAlchemy` queries to execute with `tornado.gen` ( I am using `MySQL` below `SQLAlchemy`, at the moment my handlers reads from database and return result, I would like to make this async).