Simplify webdriver tests

package.json

@@ -20,8 +20,8 @@
     "url": "https://github.com/niklasvh/html2canvas/issues"
   },
   "devDependencies": {
-    "baconjs": "^0.7.11",
     "base64-arraybuffer": ">= 0.1.0",
+    "bluebird": "^2.3.2",
     "grunt": "^0.4.5",
     "grunt-contrib-concat": "*",
     "grunt-contrib-connect": "0.7.1",
@@ -30,6 +30,7 @@
     "grunt-contrib-uglify": "*",
     "grunt-contrib-watch": "~0.5.1",
     "grunt-execute": "^0.2.2",
+    "humanize-duration": "^2.0.1",
     "lodash": "^2.4.1",
     "png-js": ">= 0.1.1",
     "wd": "^0.2.21"