title: Scrapy: how to disable or change log?
body: <p>I've followed the <a href="http://doc.scrapy.org/en/latest/intro/tutorial.html" rel="noreferrer">official tutoral of Scrapy</a>, it's wonderful!</p>
  
  <p>I'd like to remove all of DEBUG messages from console output. Is there a way?</p>
  
  <pre><code>2013-06-08 14:51:48+0000 [scrapy] DEBUG: Telnet console listening on 0.0.0.0:6029
  2013-06-08 14:51:48+0000 [scrapy] DEBUG: Web service listening on 0.0.0.0:6086
  </code></pre>
  
  <p>The doc told about to set a LOG_LEVEL, but ... in which file ?</p>
  
  <p>Replying, please make referring to this directory structure. It's the mine. 
  Plus, I've a 'test.py' in spyder folder</p>
  
  <pre><code>tutorial/
      scrapy.cfg
      tutorial/
          __init__.py
          items.py
          pipelines.py
          settings.py
          spiders/
              __init__.py
              ...
  </code></pre>
  
  <p>Where. in which file, and HOW must i set the log_level ?</p>