It's happened. I opened the PR over 2 years ago, and just got around to bringing it up to date in the last few days.
This is a huge huge update. I've never done anything like this before, but I think it works as a drop-in replacement, while allowing you to migrate any piece you wish from unsafe code to safe code. Please let me know if there are any problems you find with this.
See the safe migration doc for more details.
Note this does not build with dip1000, because the two underlying libraries (Phobos sockets and vibe.d) do not build as safe with dip1000.
-Steve