update proxy_bind to support variable
update proxy_bind to support variable
The "fastcgi_bind", "uwsgi_bind", "scgi_bind" and "memcached_bind" directives are now inherited; inherited value can be reset by the "off" parameter.  Duplicate directives are now detected.  Parameter value can now contain variables.
Merge pull request #257 from jinglong/bind

update proxy_bind to support variable