Upgrade eslint-config-airbnb to latest

Author: simonsmith

.eslintrc

@@ -4,6 +4,7 @@
     "vars-on-top": 0,
     "no-console": 0,
     "comma-dangle": [2, "never"],
+    "max-len": 0,
     "func-names": 0,
     "one-var": [2, { uninitialized: "always", initialized: "never" }],
     "no-param-reassign": [0],

package.json

@@ -34,7 +34,7 @@
   "devDependencies": {
     "chai": "^3.4.1",
     "eslint": "^1.10.3",
-    "eslint-config-airbnb": "^1.0.2",
+    "eslint-config-airbnb": "^5.0.0",
     "mocha": "^2.3.4",
     "postcss-property-lookup": "^1.1.4",
     "rewire": "^2.5.1",