Reimplement Acceptor#on_accept as a stream
Rename {Stream,}Combinators

Because Future::Combinators and not Future::FutureCombinators (any more)
Change the description of some of the Stream tests

I’m not really sure how to formulate it, but this feels better than the current wording.
Remove bad API docs from Stream#take and #drop
Make some small changes to the HTTP client example
Use streams in the HTTP client example