新增id生成器工具类

guns-core/src/main/java/com/stylefeng/guns/core/util/IdGenerator.java

+package com.stylefeng.guns.core.util;
+
+import com.baomidou.mybatisplus.toolkit.IdWorker;
+
+/**
+ * 唯一id生成器
+ *
+ * @author fengshuonan
+ * @date 2017-08-23 11:10
+ */
+public class IdGenerator {
+
+    public static String getId() {
+        return String.valueOf(IdWorker.getId());
+    }
+
+    public static long getIdLong() {
+        return IdWorker.getId();
+    }
+}