A baidu zhidao site bot, use python + tornado
demo site: http://haola.cc

How to install:
	1. python 2.6 is the minimal requirement. 
	2. to install python extra module, the best way is use setup tools. http://pypi.python.org/pypi/setuptools
	3. python lxml2 module
		sudo easy_install lxml 
		it needs libxml2 and libxslt, to instal these libraries, you can use yum or apt-get, for example: yum install libxml2-devel

How to run:
	1. chmod 755 sitecraw.py 
	2. the origin code set the running port is 8000, you may change this port number use --port option
		./sitecraw.py 
		./sitecraw.py --port=8080