asyncio_slow: Add Future examples from docs.

Author: pfalcon

asyncio_slow/test_future.py

@@ -0,0 +1,15 @@
+#https://docs.python.org/3.4/library/asyncio-task.html#example-chain-coroutines
+#import asyncio
+import asyncio_slow as asyncio
+
+@asyncio.coroutine
+def slow_operation(future):
+    yield from asyncio.sleep(1)
+    future.set_result('Future is done!')
+
+loop = asyncio.get_event_loop()
+future = asyncio.Future()
+asyncio.Task(slow_operation(future))
+loop.run_until_complete(future)
+print(future.result())
+loop.close()

asyncio_slow/test_future2.py

@@ -0,0 +1,21 @@
+#https://docs.python.org/3.4/library/asyncio-task.html#example-future-with-run-forever
+#import asyncio
+import asyncio_slow as asyncio
+
+@asyncio.coroutine
+def slow_operation(future):
+    yield from asyncio.sleep(1)
+    future.set_result('Future is done!')
+
+def got_result(future):
+    print(future.result())
+    loop.stop()
+
+loop = asyncio.get_event_loop()
+future = asyncio.Future()
+asyncio.Task(slow_operation(future))
+future.add_done_callback(got_result)
+try:
+    loop.run_forever()
+finally:
+    loop.close()