Fixed importFromUrl should parse by the file extension, and move to-markdown dependency to bower

bower.json

@@ -30,6 +30,7 @@
     "js-url": "~2.0.2",
     "socket.io-client": "~1.3.7",
     "viz.js": "~1.3.0",
-    "js-yaml": "~3.4.6"
+    "js-yaml": "~3.4.6",
+    "to-markdown": "~1.3.0"
   }
 }