Upgraded to intro.js v2.0

Issue #72

Author: mendhak

bower.json

@@ -1,6 +1,6 @@
 {
   "name": "angular-intro.js",
-  "version": "1.3.1",
+  "version": "2.0.0",
   "main": "src/angular-intro.js",
   "description": "Angular directive to wrap intro.js",
   "license": "MIT",
@@ -13,7 +13,7 @@
   ],
   "dependencies": {
     "angular": "~1.4.0",
-    "intro.js": "~1.1.1"
+    "intro.js": "https://github.com/usablica/intro.js.git#2.0"
   },
   "devDependencies": {}
 }