R1:3b8ccb0b78ee

Add "--force" and "--quickly" flags to `bin/lipsum`

Summary:
Ref T12319.

- Lipsum can trash an install by creating a lot of junk that's hard to get rid of, so we're cautious about letting you run it. Add a `--force` flag if you're sure you know what you're doing. This makes the edit/test cycle a bit easier when actually writing Lipsum generators.
- Lipsum normally sleeps for a second before creating objects, to give users more control over how much stuff they create and limit the amount of damage…