完善BT下载器，机器人可以控制刷新下载了

src/main/java/com/yutou/nas/Controllers/BTDownloadController.java

@@ -0,0 +1,17 @@
+package com.yutou.nas.Controllers;
+
+import com.yutou.nas.utils.BTDownloadManager;
+import org.springframework.stereotype.Controller;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.ResponseBody;
+
+@Controller
+public class BTDownloadController {
+
+    @ResponseBody
+    @RequestMapping("/bt/down.do")
+    public String bt(){
+        BTDownloadManager.getInstance().start();
+        return "ok";
+    }
+}