update coffee-script to version 1.11.0 (#308)

Author: jescalan

package.json

@@ -13,7 +13,7 @@
     "accord": "0.26.0",
     "autoprefixer-stylus": "0.10.0",
     "chai": "3.5.0",
-    "coffee-script": "1.10.0",
+    "coffee-script": "1.11.0",
     "css-parse": "2.0.0",
     "mocha": "3.0.2",
     "stylus": "0.54.5"