Prepare for 0.4.0.M1

Docs tweaking and package info renaming in README.md
No, as far as I can see the two are not related in the fashion you imply. I would rather say that the opposite is true: being able to request 2 billion elements at a time will be enough for all flow control purposes. We might as well change this rule to `Integer.MAX_VALUE` as far as I can see.