title: Scrapy's "pause/resume" became "pause/restart"
body: <p>Here's the thing.<br>
  Here is a large word list. I want to crawl some data according to these words. It's time-consuming so I'd like to split it into pieces.   </p>
  
  <p>First, I load a list of words into a list in <code>__init__</code> of my spider.</p>
  
  <pre><code>def __init__(self, category=None, *args, **kwargs):
      super(GlosbeSpider, self).__init__(*args, **kwargs)
      list_file = open('glosbe/vi/word4/word_list_4', 'r')
      for lines in list_file:
          lines = lines.strip()
          self.word_list.append(lines)
      list_file.close()
      print 'INIT!!!!!'
  </code></pre>
  
  <p>Then I create some initial requests in <code>start_requests()</code>:</p>
  
  <pre><code>def start_requests(self):
      container = []
      for word in self.word_list:
          url = "https://glosbe.com/gapi/tm?from=zh&amp;dest=%s&amp;format=json&amp;phrase=%s&amp;page=%d&amp;pretty=true" % (
              self.language, word, 1)
          meta_info = {'page_num': 1, 'word': word}
          new_req = scrapy.Request(url, callback=self.parse_json, meta=meta_info, dont_filter=True,
                                   errback=self.process_error)
          container.append(new_req)
      print 'START_REQUESTS!!!!!'
      return container
  </code></pre>
  
  <p>And I parse items in <code>parse_json()</code>(code is omitted here, not important).  </p>
  
  <p>According to the official document, if I use the same command twice in the shell  like: </p>
  
  <pre><code>scrapy crawl MySpider -s JOBDIR=dir_I_want_to_use
  </code></pre>
  
  <p>then the crawler will continue its work from where it stops.</p>
  
  <p>However, when I resume the job using the same command above, there're still </p>
  
  <pre><code>INIT!!!!!
  START_REQUESTS!!!!!
  </code></pre>
  
  <p>on the screen. Why? I think it should continue its parsing process without calling <code>start_requests()</code>.<br>
  If I want to continue my crawling job from where I stopped, how could I deal with it? Thanks.</p>