refactor: gatsby-browser, gatsby-node

adds .eslintcache to gitignore

.eslintrc

@@ -6,13 +6,13 @@
         "import"
     ],
     "rules": {
+        "global-require": [0],
         "react/jsx-filename-extension": [0],
         "react/prefer-es6-class": [0],
-        "global-require": [0],
         "react/prefer-stateless-function": [0],
         /* to allow importing 'gatsby-helpers' */
         "import/no-extraneous-dependencies": [0],
         "import/no-unresolved": [0],
         "import/extensions": [0]
     }
-}
+}