chore(package): update eslint to version 2.2.0

http://greenkeeper.io/

.eslintrc

@@ -8,7 +8,7 @@
     "no-mixed-spaces-and-tabs": 2,
     "quotes": [2, "single", "avoid-escape"],
     "semi": 2,
-    "space-after-keywords": 2,
+    "keyword-spacing": 2,
     "space-before-function-paren": 2,
 
     "curly": 0,

package.json

@@ -41,7 +41,7 @@
   },
   "devDependencies": {
     "chai": "^3.4.0",
-    "eslint": "^1.7.3",
+    "eslint": "^2.2.0",
     "mocha": "^2.1.0",
     "zuul": "^3.7.0"
   },