Merge pull request #549 from brson/release

Update for 1.12

Author: brson

_config.yml

@@ -1,7 +1,7 @@
 name: The Rust Programming Language
-stable: "1.11.0"
-stable_date: "2016-08-18"
-stable_blog: "/2016/08/18/Rust-1.11.html"
-beta: "1.12"
-beta_date: "2016-09-29"
-nightly: "1.13"
+stable: "1.12.0"
+stable_date: "2016-09-29"
+stable_blog: "/2016/09/29/Rust-1.12.html"
+beta: "1.13"
+beta_date: "2016-11-10"
+nightly: "1.14"