proxy_bind, memcached_bind, fastcgi_bind, scgi_bind, uwsgi_bind can set more than one ip address now
add test case for proxy_bind
add more test cases for proxy_bind
Merge pull request #262 from jinglong/bind

proxy_bind, memcached_bind, fastcgi_bind, scgi_bind, uwsgi_bind can set more than one ip address now