mv .gitignore. fix indents. update eslint config. use export and global to fix eslint errors

eslint-example/.eslintrc.json

@@ -1,10 +1,16 @@
 {
-		"globals": {"chrome": true},
+    "globals": {
+        "browser": true,
+        "chrome": true
+    },
     "rules": {
         "no-set-state": "off"
     },
     "env": {
         "browser": true,
         "es6": true
-    }
+    },
+    "extends": [
+      "eslint:recommended"
+    ]
 }

eslint-example/file.js

@@ -1,3 +1,4 @@
+/* exported getUsefulContents */
 // we cant use export here
 function getUsefulContents(callback) {
     callback('Hello World');

eslint-example/main.js

@@ -1,3 +1,4 @@
+/* global getUsefulContents */
 // not supported in Firefox
 // import { getUsefulContents } from "file";