Upgrade ESLint to v3 (#8299)

* upgraded habitrpg-eslint-config to v2 and eslint to v3

* adapt to eslint3 rules

* update shrinkwrap

* update shrinkwrap again

test/api/v3/unit/libs/analyticsService.test.js

@@ -353,7 +353,8 @@ describe('analyticsService', () => {
         purchaseType: 'checkout',
         gift: false,
         quantity: 1,
-        headers: {'x-client': 'habitica-web',
+        headers: {
+          'x-client': 'habitica-web',
           'user-agent': '',
         },
       };