Merge pull request #261 from jemygraw/master

improve the efficiency mentioned in issue 203

Author: jemygraw

qiniu/http.py

@@ -20,6 +20,7 @@
 def __return_wrapper(resp):
     if resp.status_code != 200 or resp.headers.get('X-Reqid') is None:
         return None, ResponseInfo(resp)
+    resp.encoding = 'utf-8'
     ret = resp.json() if resp.text != '' else {}
     return ret, ResponseInfo(resp)