chore(package): update eslint to version 2.5.1

http://greenkeeper.io/

Author: greenkeeperio-bot

package.json

@@ -83,7 +83,7 @@
   "devDependencies": {
     "chai": "^3.4.1",
     "coveralls": "^2.11.6",
-    "eslint": "^1.10.3",
+    "eslint": "^2.5.1",
     "istanbul": "^0.4.1",
     "jscs": "^2.7.0",
     "mkdirp": "^0.5.1",