Ruby 2.0.0 released

(Yes, yes; I know; it's just... it's stupid. It's a *tool*; if you rev it out from underneath people who've written scads of code, especially if you stop supporting it, you've just wasted their energy. I note that C was created in 197mumble, and has changed maybe 3 times. Nearly every line of code ever written in ANSI C will still compile.)