osx下执行，发现几个bug

[ohyeah521]

启动参数：./fqdns.py serve

def query_smartly(self, domain):
first_china_upstream = self.china_upstreams[0] # 这里self.china_upstreams为空，所以程序报异常。

[congzhu]

同样的问题
2014-08-29 17:50:02,570 ERROR failed to query DNS(qd=[Q(name='www.baidu.com')], id=20177) due to list index out of range
Traceback (most recent call last):
File "/Users/zhucong/Documents/Github/fqdns/fqdns.py", line 192, in call
response = self.query(request, raw_request)
File "/Users/zhucong/Documents/Github/fqdns/fqdns.py", line 222, in query
answers = self.query_smartly(domain)
File "/Users/zhucong/Documents/Github/fqdns/fqdns.py", line 249, in query_smartly
first_china_upstream = self.china_upstreams[0]
IndexError: list index out of range