feat: use Number.toLocaleString to support localization

.gitignore

@@ -1,5 +1,6 @@
 .coveralls.yml
 .DS_Store
+.nyc_output
 *.log
 coverage
 node_modules

.travis.yml

@@ -9,16 +9,10 @@ node_js:
 cache:
   directories:
     - ~/.npm
-    - travis_phantomjs
 
 env:
   global:
-    - BIN=node ISTANBUL=false
     - secure: XOINlYZG3DYXq5agQXvkad2MfnOO/+z40fn37RKfNuxNI5veBK7tPRcCIQ998o+NyVTpyd3NZhqkowCxAL8bp4HJ81SesRKQSaXoSzgV7CnloxLxcduiiRJ6lnxFGgCbpqyLxZHWr0mQugcLhs5nhiZ5Dnw6dZxYX/oKKvOomZA=
-  matrix:
-    -
-    - ISTANBUL=true
-    - BIN=phantomjs
 
 git:
   depth: 10
@@ -28,26 +22,11 @@ branches:
     - master
 
 before_install:
-  # Upgrade PhantomJS.
-  - |
-      export PHANTOMJS_VERSION=2.1.1
-      export PATH=$PWD/travis_phantomjs/phantomjs-$PHANTOMJS_VERSION-linux-x86_64/bin:$PATH
-      if [ $(phantomjs --version) != $PHANTOMJS_VERSION ]; then
-        rm -rf $PWD/travis_phantomjs
-        mkdir -p $PWD/travis_phantomjs
-        wget https://github.com/Medium/phantomjs/releases/download/v$PHANTOMJS_VERSION/phantomjs-$PHANTOMJS_VERSION-linux-x86_64.tar.bz2
-        tar -xvf phantomjs-$PHANTOMJS_VERSION-linux-x86_64.tar.bz2 -C $PWD/travis_phantomjs
-      fi
-      phantomjs -v
-
   - nvm use $TRAVIS_NODE_VERSION
   - npm i -g npm
 
 script:
-  - |
-      if [ $ISTANBUL = true ]; then
-        istanbul cover -x "**/vendor/**" --report lcovonly ./test/test.js && cat ./coverage/lcov.info | coveralls && rm -rf ./coverage
-      else
-        cd ./test
-        $BIN ./test.js
-      fi
+  - npm run test
+
+after_success:
+  - npm run coverage

README.md

@@ -74,7 +74,7 @@ suite.add('RegExp#test', function() {
   console.log('Fastest is ' + this.filter('fastest').map('name'));
 })
 // run async
-.run({ 'async': true });
+.run({ 'async': true, 'locale': 'en-US' });
 
 // logs:
 // => RegExp#test x 4,161,532 +-0.99% (59 cycles)
@@ -86,6 +86,26 @@ suite.add('RegExp#test', function() {
 
 Tested in Chrome 54-55, Firefox 49-50, IE 11, Edge 14, Safari 9-10, Node.js 6-7, & PhantomJS 2.1.1.
 
+## Localization
+
+Results are formatted using [Number.prototype.toLocaleString](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/toLocaleString)
+
+### Node.js
+
+Node.js does not support all number localizations by default. Install the optional [full-icu](https://www.npmjs.com/package/full-icu) package
+
+```
+npm i --save full-icu
+```
+
+and run your benchmark as follows:
+
+```
+NODE_ICU_DATA=./node_modules/full-icu node your_benchmark.js
+```
+
+Read the [Internationalization chapter](https://nodejs.org/dist/latest/docs/api/intl.html) from the Node.js documentation for more information.
+
 ## BestieJS
 
 Benchmark.js is part of the BestieJS *“Best in Class”* module collection. This means we promote solid browser/environment support, ES5+ precedents, unit testing, & plenty of documentation.

benchmark.js

@@ -787,12 +787,17 @@
      * @static
      * @memberOf Benchmark
      * @param {number} number The number to convert.
+     * @param {locale} string Identifying string of the locale to use.
      * @returns {string} The more readable string representation.
      */
-    function formatNumber(number) {
-      number = String(number).split('.');
-      return number[0].replace(/(?=(?:\d{3})+$)(?!\b)/g, ',') +
-        (number[1] ? '.' + number[1] : '');
+    function formatNumber(number, locale) {
+      if (typeof Number.prototype.toLocaleString === 'function') {
+        return number.toLocaleString(locale);
+      } else {
+        number = String(number).split('.');
+        return number[0].replace(/(?=(?:\d{3})+$)(?!\b)/g, ',') +
+          (number[1] ? '.' + number[1] : '');
+      }
     }
 
     /**
@@ -1527,6 +1532,7 @@
           error = bench.error,
           hz = bench.hz,
           id = bench.id,
+          locale = bench.locale,
           stats = bench.stats,
           size = stats.sample.length,
           pm = '\xb1',
@@ -1545,7 +1551,7 @@
         result += ': ' + errorStr;
       }
       else {
-        result += ' x ' + formatNumber(hz.toFixed(hz < 100 ? 2 : 0)) + ' ops/sec ' + pm +
+        result += ' x ' + formatNumber(hz.toFixed(hz < 100 ? 2 : 0), locale) + ' ops/sec ' + pm +
           stats.rme.toFixed(2) + '% (' + size + ' run' + (size == 1 ? '' : 's') + ' sampled)';
       }
       return result;
@@ -2262,7 +2268,15 @@
          * @memberOf Benchmark.options
          * @type Function
          */
-        'onStart': undefined
+        'onStart': undefined,
+
+        /**
+         * The locale used for formatting numbers
+         *
+         * @memberOf Benchmark.options
+         * @type string
+         */
+        'locale': undefined
       },
 
       /**