Transitioned from synchronous to asynchronous

Using the new 'async def' functionality in Python 3.5!
Still crappy GUI, we're going to replace that.

blender_cloud/async_loop.py

@@ -0,0 +1,49 @@
+"""Manages the asyncio loop."""
+
+import asyncio
+import bpy
+
+
+def kick_async_loop(*args):
+    loop = asyncio.get_event_loop()
+
+    if loop.is_closed():
+        print('{}: loop closed, stopping'.format(__name__))
+        stop_async_loop()
+        return
+
+    if not asyncio.Task.all_tasks():
+        print('{}: no more scheduled tasks, stopping'.format(__name__))
+        stop_async_loop()
+        return
+
+    # Perform a single async loop step
+    async def do_nothing():
+        pass
+
+    loop.run_until_complete(do_nothing())
+
+
+def async_loop_handler() -> callable:
+    name = kick_async_loop.__name__
+    for handler in bpy.app.handlers.scene_update_pre:
+        if getattr(handler, '__name__', '') == name:
+            return handler
+    return None
+
+
+def ensure_async_loop():
+    if async_loop_handler() is not None:
+        return
+    bpy.app.handlers.scene_update_pre.append(kick_async_loop)
+
+
+def stop_async_loop():
+    handler = async_loop_handler()
+    if handler is None:
+        return
+    bpy.app.handlers.scene_update_pre.remove(handler)
+
+    # Optional: cancel all pending tasks.
+    # for task in asyncio.Task.all_tasks():
+    #     task.cancel()