version bumps etc for release of 0.6.0

Author: jamesalley

package.json

@@ -2,7 +2,7 @@
   "name": "pure-site",
   "description": "The Pure CSS website.",
   "homepage": "http://purecss.io/",
-  "version": "1.18.10",
+  "version": "1.18.12",
   "private": true,
   "repository": "git://github.com/yahoo/pure-site.git",
   "contributors": [