Added missing coroutine import

Thanks to Cody Scott for noticing.

asphalt/core/command.py

@@ -34,6 +34,8 @@ def quickstart_application():
 
     with (top_package / 'application.py').open('w') as f:
         f.write("""\
+from asyncio import coroutine
+
 from {app_cls.__module__} import {app_cls.__name__}
 from {context_cls.__module__} import {context_cls.__name__}
 

tests/test_command.py

@@ -31,6 +31,8 @@ def mock_input(text):
     # Check that example/application.py was properly generated
     with projectdir.join('example').join('application.py').open() as f:
         assert f.read() == """\
+from asyncio import coroutine
+
 from asphalt.core.application import Application
 from asphalt.core.context import ApplicationContext