title: Tweepy cursor .pages() with api.search_users returning same page again and again
body: <pre><code>    auth = tweepy.OAuthHandler(consumer_token, consumer_secret)
      auth.set_access_token(access_token, access_secret)
      api = tweepy.API(auth)
      user_objs = []
      name = "phungsuk wangdu"
      id_strs = {}
      page_no = 0
      try:
          for page in tweepy.Cursor(api.search_users, name).pages(3):
              dup_count = 0
              print("*******  Page", str(page_no))
              print("Length of page", len(page))
              user_objs.extend(page)
              for user_obj in page:
                  id_str = user_obj._json['id_str']
                  if id_str in id_strs:
                      # print("Duplicate for:", id_str, "from page number:", id_strs[id_str])
                      dup_count += 1
                  else:
                      # print(id_str)
                      id_strs[id_str] = page_no
              time.sleep(1)
              print("Duplicates in page", str(page_no), str(dup_count))
              page_no += 1
      except Exception as ex:
          print(ex)
  </code></pre>
  
  <p>With the above code, I am trying to get the search results for users using tweepy(Python 3.5.2, tweepy 3.5.0) cursor. The results are being duplicated with the pages parameter being passed. Is it the right way to query the search_users using the tweepy cursor? I am getting results for the above code with the following pattern: </p>
  
  <pre><code>1. for low search results(name = "phungsuk wangdu") (There are actually 9 results returned for manual search on twitter website):
  
      *******  Page 0
      Length of page 2
      Duplicates in page 0 0
      *******  Page 1
      Length of page 2
      Duplicates in page 1 2
      *******  Page 2
      Length of page 2
      Duplicates in page 2 2
      *******  Page 3
      Length of page 2
      Duplicates in page 3 2
  
  2. for high search results (name = "jon snow")
  
      *******  Page 0
      Length of page 20
      Duplicates in page 0 0
      *******  Page 1
      Length of page 20
      Duplicates in page 1 20
      *******  Page 2
      Length of page 20
      Duplicates in page 2 0
      *******  Page 3
      Length of page 20
      Duplicates in page 3 0
  </code></pre>