增加根据openid获取用户信息的重载方法，不指定语言，默认使用zh_CN

Author: binarywang

weixin-java-mp/src/main/java/me/chanjar/weixin/mp/api/WxMpUserService.java

@@ -1,12 +1,12 @@
 package me.chanjar.weixin.mp.api;
 
-import java.util.List;
-
 import me.chanjar.weixin.common.exception.WxErrorException;
 import me.chanjar.weixin.mp.bean.WxMpUserQuery;
 import me.chanjar.weixin.mp.bean.result.WxMpUser;
 import me.chanjar.weixin.mp.bean.result.WxMpUserList;
 
+import java.util.List;
+
 /**
  * 用户管理相关操作接口
  *
@@ -25,10 +25,22 @@ public interface WxMpUserService {
    */
   void userUpdateRemark(String openid, String remark) throws WxErrorException;
 
+  /**
+   * <pre>
+   * 获取用户基本信息（语言为默认的zh_CN 简体）
+   * 详情请见: http://mp.weixin.qq.com/wiki?t=resource/res_main&id=mp1421140839&token=&lang=zh_CN
+   * http请求方式: GET https://api.weixin.qq.com/cgi-bin/user/info?access_token=ACCESS_TOKEN&openid=OPENID&lang=zh_CN
+   * </pre>
+   *
+   * @param openid 用户openid
+   */
+  WxMpUser userInfo(String openid) throws WxErrorException;
+
   /**
    * <pre>
    * 获取用户基本信息
-   * 详情请见: http://mp.weixin.qq.com/wiki/index.php?title=获取用户基本信息
+   * 详情请见: http://mp.weixin.qq.com/wiki?t=resource/res_main&id=mp1421140839&token=&lang=zh_CN
+   * http请求方式: GET https://api.weixin.qq.com/cgi-bin/user/info?access_token=ACCESS_TOKEN&openid=OPENID&lang=zh_CN
    * </pre>
    *
    * @param openid 用户openid

weixin-java-mp/src/main/java/me/chanjar/weixin/mp/api/impl/WxMpUserServiceImpl.java

@@ -1,16 +1,15 @@
 package me.chanjar.weixin.mp.api.impl;
 
-import java.util.List;
-
 import com.google.gson.JsonObject;
-
 import me.chanjar.weixin.common.exception.WxErrorException;
 import me.chanjar.weixin.mp.api.WxMpService;
 import me.chanjar.weixin.mp.api.WxMpUserService;
 import me.chanjar.weixin.mp.bean.WxMpUserQuery;
 import me.chanjar.weixin.mp.bean.result.WxMpUser;
 import me.chanjar.weixin.mp.bean.result.WxMpUserList;
 
+import java.util.List;
+
 /**
  * Created by Binary Wang on 2016/7/21.
  */
@@ -31,6 +30,11 @@ public void userUpdateRemark(String openid, String remark) throws WxErrorExcepti
     this.wxMpService.post(url, json.toString());
   }
 
+  @Override
+  public WxMpUser userInfo(String openid) throws WxErrorException {
+    return this.userInfo(openid, null);
+  }
+
   @Override
   public WxMpUser userInfo(String openid, String lang) throws WxErrorException {
     String url = API_URL_PREFIX + "/info";