Update eslint rules. Fix source accordingly.

Author: vellotis

.eslintrc

@@ -2,6 +2,7 @@
   "parser": "babel-eslint",
   "extends": "eslint:recommended",
   "env": {
+    "browser": true,
     "es6": true,
     "node": true
   },
@@ -10,13 +11,13 @@
     "modules": true
   },
   "rules": {
-    "indent": [2, 4, {"SwitchCase": 1}],
-    "no-console": 1,
-    "no-const-assign": 2,
-    "no-tabs": 1,
-    "no-unused-vars": [1, {"vars": "all", "args": "none"}],
-    "no-var": 1,
-    "prefer-const": 1,
-    "no-trailing-spaces": 1
+    "indent": ["error", 4, {"SwitchCase": 1}],
+    "no-console": ["error"],
+    "no-const-assign": ["error"],
+    "no-tabs": ["error"],
+    "no-unused-vars": ["error", {"vars": "all", "args": "none"}],
+    "no-var": ["error"],
+    "prefer-const": ["error"],
+    "no-trailing-spaces": ["error"]
   }
 }

src/hwcrypto.js

@@ -1,4 +1,3 @@
-/*global window location*/
 'use strict'
 
 // JavaScript library as described in

src/interfaces/DigiDocExtension.js

@@ -1,6 +1,5 @@
 /*global window navigator*/
 import NotImplementedPlugin from '../NotImplementedPlugin'
-import * as CONSTANTS from '../constants'
 import { hasExtensionFor } from '../utils'
 
 const digidoc_chrome = 'TokenSigning'

src/interfaces/DigiDocPlugin.js

@@ -1,9 +1,7 @@
-/*global navigator*/
 import { hasPluginFor, loadPluginFor, _debug } from '../utils'
 import * as CONSTANTS from '../constants'
 import NotImplementedPlugin from '../NotImplementedPlugin'
 
-// 
 const digidoc_mime = 'application/x-digidoc'
 
 function code2str(err) {

src/utils.js

@@ -1,5 +1,3 @@
-/*global navigator window document XMLHttpRequest*/
-
 import * as CONSTANTS from './constants'
 
 // Returns "true" if a plugin is present for the MIME