Fix Event Loop conflict

[wiltshirek]

Neo4J: AsyncGraphDatabase needs get_event_loop opposed to get_running_loop.

   try:
        **loop = asyncio.get_event_loop()**
    except RuntimeError:
        logger.info("Creating a new event loop in main thread.")
        loop = asyncio.new_event_loop()
        asyncio.set_event_loop(loop)
    return loop