2.0.0-alpha-2

[Christopher]

I'm planning to prepare a 2.0.0-alpha-2-rc1 Thursday. So, merge your
stuff if you want me to include it then.
Depending on the quality of this alpha, we may want to do a beta (with
an API freeze?)... or just release 2.0.0 next. I wouldn't think we'd
want too many alphas.