bump grunt-contrib-jade to ~0.12.0

package.json

@@ -42,7 +42,7 @@
     "grunt-contrib-copy": "~0.5.0",
     "grunt-contrib-csslint": "~0.2.0",
     "grunt-contrib-cssmin": "~0.9.0",
-    "grunt-contrib-jade": "~0.11.0",
+    "grunt-contrib-jade": "~0.12.0",
     "grunt-contrib-jshint": "~0.10.0",
     "grunt-contrib-less": "~0.11.0",
     "grunt-contrib-qunit": "~0.5.1",