add italian, korean and mainland chinese locales support

src/Dater/Locale/It.php

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+<?php
+
+namespace Dater\Locale;
+use Dater\Dater;
+
+class It extends \Dater\Locale {
+
+    protected static $months = array('Gennaio', 'Febbraio', 'Marzo', 'Aprile', 'Maggio', 'Giugno', 'Luglio', 'Agosto', 'Settembre', 'Ottobre', 'Novembre', 'Dicembre');
+    protected static $weekDays = array('Lunedì', 'Martedì', 'Mercoledì', 'Giovedì', 'Venerdì', 'Sabato', 'Domenica');
+    protected static $weekDaysShort = array('Lun', 'Mar', 'Mer', 'Gio', 'Ven', 'Sab', 'Dom');
+
+    // Referring to https://en.wikipedia.org/wiki/Date_format_by_country
+    protected static $formats = array(
+        Dater::USER_DATE_FORMAT => 'd-m-Y',
+        Dater::USER_TIME_FORMAT => 'H:i',
+        Dater::USER_DATETIME_FORMAT => 'd-m-Y H:i',
+    );
+}

src/Dater/Locale/Ko.php

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+<?php
+
+namespace Dater\Locale;
+use Dater\Dater;
+
+class Ko extends \Dater\Locale {
+
+    protected static $months = array('1월', '2월', '3월', '4월', '5월', '6월', '7월', '8월', '9월', '10월', '11월', '12월');
+    protected static $weekDays = array('월요일', '화요일', '수요일', '목요일', '금요일', '토요일', '일요일');
+    protected static $weekDaysShort = array('월요일', '화요일', '수요일', '목요일', '금요일', '토요일', '일요일');
+
+    // Referring to https://en.wikipedia.org/wiki/Date_format_by_country
+    protected static $formats = array(
+        Dater::USER_DATE_FORMAT => 'Y년m월d일',
+        Dater::USER_TIME_FORMAT => 'H시 i분',
+        Dater::USER_DATETIME_FORMAT => 'Y년m월d일 H시 i분',
+    );
+}

src/Dater/Locale/ZhCn.php

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+<?php
+
+namespace Dater\Locale;
+use Dater\Dater;
+
+class ZhCn extends \Dater\Locale {
+
+    protected static $months = array('一月', '二月', '三月', '四月', '五月', '六月', '七月', '八月', '九月', '十月', '十一月', '十二月');
+    protected static $weekDays = array('星期一', '星期二', '星期三', '星期四', '星期五', '星期六', '星期天');
+    protected static $weekDaysShort = array('星期一', '星期二', '星期三', '星期四', '星期五', '星期六', '星期天');
+
+    // Referring to https://en.wikipedia.org/wiki/Date_format_by_country
+    protected static $formats = array(
+        Dater::USER_DATE_FORMAT => 'Y年m月d日',
+        Dater::USER_TIME_FORMAT => 'H时i分',
+        Dater::USER_DATETIME_FORMAT => 'Y年m月d日 H时i分',
+    );
+}