title: scrapy log handler
body: <p>I seek your help in the following 2 questions - How do I set the handler for the different log levels like in python. Currently, I have </p>
  
  <pre><code>STATS_ENABLED = True
  STATS_DUMP = True 
  
  LOG_FILE = 'crawl.log'
  </code></pre>
  
  <p>But the debug messages generated by Scrapy are also added into the log files. Those are very long and ideally, I would  like the DEBUG level messages to left on standard error and INFO messages to be dump to my <code>LOG_FILE</code>.</p>
  
  <p>Secondly, in the docs, it says <code>The logging service must be explicitly started through the scrapy.log.start() function.</code> My question is, where do I run this <code>scrapy.log.start()</code>? Is it inside my spider?</p>