allow sub-manager tasks to use own app rather than parent's

[emosbaugh]

it was hard for me to understand the logic in this method. i have tried to amend it to make the sub-manager task use its app rather than the parent's. all unit tests pass. perhaps another should be written to assert the correct app is used for default tasks.

[emosbaugh]

the example in the readme does not work for me. when i call python manage.py runserver it starts the parent app (MyApp) rather than the sub-manager app (MyAdminApp).

def gen_admin(app, **kwargs):
    from myweb.admin import MyAdminApp
    ## easiest but possibly incomplete way to copy your settings
    return MyAdminApp(config=app.config, **kwargs)
sub_manager = Manager(gen_admin)

manager = Manager(MyApp)
manager.add_command("admin", sub_manager)

[torotil]

I see this issue too. The build is only failing because the build for the original branch was failing for Python 3.3 at that time. Rebasing would fix that.

[bitbier]

Any word on getting in? As it stands right now the submanager functionality is broken because the __call__ function on the Manager doesn't allow sub managers to override the app with their own function. Seems to have been broken for a while.