Use standard and prettier (#10)

* switch from custom eslint config to standard + prettier

* fix new standard eslint violations

* add editorconfig file

* auto-fix all other violations

* update lint yarn script

* remove jshint comment

Gruntfile.js

@@ -1,19 +1,22 @@
-module.exports = function (grunt) {
+const { resolve } = require('path');
+
+module.exports = function(grunt) {
   // load plugins
   require('load-grunt-config')(grunt, {
-    configPath: __dirname + '/grunt/config',
+    configPath: resolve(__dirname, 'grunt/config'),
     init: true,
     config: {
-      distDir: __dirname + '/dist',
-      bowerSubmodule: __dirname + '/src/bower_es_js',
+      distDir: resolve(__dirname, 'dist'),
+      bowerSubmodule: resolve(__dirname, 'src/bower_es_js'),
       meta: {
-        banner: '/*! <%= package.name %> - v<%= package.version %> - ' +
+        banner:
+          '/*! <%= package.name %> - v<%= package.version %> - ' +
           '<%= grunt.template.today("yyyy-mm-dd") %>\n' +
           '<%= package.homepage ? " * " + package.homepage + "\\n" : "" %>' +
           ' * Copyright (c) <%= grunt.template.today("yyyy") %> <%= package.author.company %>;' +
-          ' Licensed <%= package.license %> */\n'
-      }
-    }
+          ' Licensed <%= package.license %> */\n',
+      },
+    },
   });
 
   // load task definitions