title: Spider not scraping page/writing
body: <p>I am using the following code to scrape data using scrapey:</p>
  
  <pre><code>from scrapy.selector import Selector
  from scrapy.spider import Spider
  
  
  class ExampleSpider(Spider):
      name = "example"
      allowed_domains = ["dmoz.org"]
      start_urls = [
          "http://www.dmoz.org/Computers/Programming/Languages/Python/Books/",
          "http://www.dmoz.org/Computers/Programming/Languages/Python/Resources/"
      ]
  
      def parse(self, response):
          sel = Selector(response)
          for li in sel.xpath('//ul/li'):
              title = li.xpath('a/text()').extract()
              link = li.xpath('a/@href').extract()
              desc = li.xpath('text()').extract()
              print title, link, desc
  </code></pre>
  
  <p>However, when I run this spider, I get the following message:</p>
  
  <pre><code>2014-06-30 23:39:00-0500 [scrapy] INFO: Scrapy 0.24.1 started (bot: tutorial)
  2014-06-30 23:39:00-0500 [scrapy] INFO: Optional features available: ssl, http11
  2014-06-30 23:39:00-0500 [scrapy] INFO: Overridden settings: {'NEWSPIDER_MODULE': 'tutorial.spiders', 'FEED_FORMAT': 'csv', 'SPIDER_MODULES': ['tutorial.spiders'], 'FEED_URI': 'willthiswork.csv', 'BOT_NAME': 'tutorial'}
  2014-06-30 23:39:01-0500 [scrapy] INFO: Enabled extensions: FeedExporter, LogStats, TelnetConsole, CloseSpider, WebService, CoreStats, SpiderState
  2014-06-30 23:39:01-0500 [scrapy] INFO: Enabled downloader middlewares: HttpAuthMiddleware, DownloadTimeoutMiddleware, UserAgentMiddleware, RetryMiddleware, DefaultHeadersMiddleware, MetaRefreshMiddleware, HttpCompressionMiddleware, RedirectMiddleware, CookiesMiddleware, ChunkedTransferMiddleware, DownloaderStats
  2014-06-30 23:39:01-0500 [scrapy] INFO: Enabled spider middlewares: HttpErrorMiddleware, OffsiteMiddleware, RefererMiddleware, UrlLengthMiddleware, DepthMiddleware
  2014-06-30 23:39:01-0500 [scrapy] INFO: Enabled item pipelines: 
  2014-06-30 23:39:01-0500 [example] INFO: Spider opened
  2014-06-30 23:39:01-0500 [example] INFO: Crawled 0 pages (at 0 pages/min), scraped 0 items (at 0 items/min)
  2014-06-30 23:39:01-0500 [scrapy] DEBUG: Telnet console listening on 127.0.0.1:6023
  2014-06-30 23:39:01-0500 [scrapy] DEBUG: Web service listening on 127.0.0.1:6080
  2014-06-30 23:39:01-0500 [example] DEBUG: Crawled (200) &lt;GET http://www.dmoz.org/Computers/Programming/Languages/Python/Resources/&gt; (referer: None)
  </code></pre>
  
  <p>Of note is the line "Crawled 0 pages (at 0 pages/min....., as well as the overridden settings.</p>
  
  <p>Additionally, the file I intended to write my data to is completely blank.  </p>
  
  <p>Is there something I am doing wrong that is causing data not to write?</p>