darkrho/scrapy-redis — pull request #13 by nopper (2013-10-01 12:31:45+00:00)
Title: Fix NameError due to not defined host, port vars

I got this exception while trying to start a simple crawl. The simple patch should fix it.

```
Traceback (most recent call last):
File "/Users/nopper/.pythonbrew/venvs/Python-2.7.3/frugal/bin/scrapy", line 4, in
execute()
File "/Users/nopper/.pythonbrew/venvs/Python-2.7.3/frugal/lib/python2.7/site-packages/scrapy/cmdline.py", line 142, in execute
_run_print_help(parser, _run_command, cmd, args, opts)
File "/Users/nopper/.pythonbrew/venvs/Python-2.7.3/frugal/lib/python2.7/site-packages/scrapy/cmdline.py", line 88, in _run_print_help
func(*a, **kw)
File "/Users/nopper/.pythonbrew/venvs/Python-2.7.3/frugal/lib/python2.7/site-packages/scrapy/cmdline.py", line 149, in _run_command
cmd.run(args, opts)
File "/Users/nopper/.pythonbrew/venvs/Python-2.7.3/frugal/lib/python2.7/site-packages/scrapy/commands/crawl.py", line 49, in run
crawler.crawl(spider)
File "/Users/nopper/.pythonbrew/venvs/Python-2.7.3/frugal/lib/python2.7/site-packages/scrapy/crawler.py", line 48, in crawl
spider.set_crawler(self)
File "/Users/nopper/.pythonbrew/venvs/Python-2.7.3/frugal/lib/python2.7/site-packages/scrapy_redis/spiders.py", line 45, in set_crawler
self.setup_redis()
File "/Users/nopper/.pythonbrew/venvs/Python-2.7.3/frugal/lib/python2.7/site-packages/scrapy_redis/spiders.py", line 24, in setup_redis
self.log("Reading URLs from redis list '%s' at %s:%s." % (self.redis_key, host, port))
NameError: global name 'host' is not defined
```