This makes the code a bit shorter by not having to use `props.` all of
the time. Also make everything VoidFunctionComponent while we are
touching this.
This fixes the simple cases of callback props using lambda functions.
This will prevent rerendering in some cases since a new callback
function is not created on each call.
This uses the real rootReducer to populate the initial state in the test
AsyncSaga. This way we don't have to populate default values. Since it
isn't used often, we can omit the parameter and just call the updateState()
method after creating the object if modifications are needed.
David Lechner