Update Bower.json per latest spec (#4371)

* Remove moot `version` property from bower.json

Per bower/bower.json-spec@a325da3

* No need for bower to know about dev dependencies, and this is one less thing to keep in sync

bower.json

@@ -1,6 +1,5 @@
 {
   "name": "coffee-script",
-  "version": "1.11.1",
   "main": [
     "lib/coffee-script/coffee-script.js"
   ],
@@ -11,13 +10,6 @@
     "coffeescript",
     "compiler"
   ],
-  "devDependencies": {
-    "uglify-js": "~2.2",
-    "jison": ">=0.2.0",
-    "highlight.js": "~9.6.0",
-    "underscore": "~1.5.2",
-    "docco": "~0.6.2"
-  },
   "author": {
     "name": "Jeremy Ashkenas"
   },