Use new api to get task list.

BTW, Fix following issue, 

Traceback (most recent call last):
  File "./xfdown.py", line 134, in <module>
    XFdownUi().main()
  File "./xfdown.py", line 96, in main
    self.work()
  File "./xfdown.py", line 100, in work
    xf.download(self.getSelected())
  File "/home/trinity/Workspace/xfdown/xfdown_api.py", line 111, in download
    self.gethttp(lists)
  File "/home/trinity/Workspace/xfdown/xfdown_api.py", line 306, in gethttp
    self.filehttp[num]=(re.search(r'\"com_url\":\"(.+?)\"\,\"',str).group(1))
AttributeError: 'NoneType' object has no attribute 'group'

xfdown_api.py

@@ -250,8 +250,8 @@ def getlist(self):
             """
             得到任务名与hash值
             """
-            urlv = 'http://lixian.qq.com/handler/lixian/get_lixian_list.php'
-            res = self.__request(urlv)
+            urlv = 'http://lixian.qq.com/handler/lixian/get_lixian_items.php'
+            res = self.__request(urlv, {'page': 0, 'limit': 500})
             res = json.JSONDecoder().decode(res)
             result = []
             if res["msg"]==_('未登录!'):
@@ -273,7 +273,7 @@ def getlist(self):
                 for num in range(len(res['data'])):
                     index=res['data'][num]
                     self.filename.append(index['file_name'].encode("u8"))
-                    self.filehash.append(index['code'])
+                    self.filehash.append(index['hash'])
                     size=index['file_size']
                     self.filemid.append(index['mid'])
                     if size==0: