Upgrade dev dependencies.

Author: domenic

package.json

@@ -18,8 +18,8 @@
         "phantomjs": "^1.9.7-1"
     },
     "devDependencies": {
-        "chai": "~1.9.0",
+        "chai": "~1.9.1",
         "jshint": "~2.4.3",
-        "mocha": "~1.17.1"
+        "mocha": "~1.18.2"
     }
 }