remove redundant rule file

rule_sample/README.md

@@ -9,9 +9,6 @@ The following are sample rules.
 * rule_allow_CORS.js
     * add CORS headers to allow cross-domain ajax request
     * 为ajax请求增加跨域头
-* rule_assign_ip_address.js
-    * assign an ip address to a specified domain
-    * 为某个域名指定ip地址
 * rule_intercept_some_https_requests.js
     * intercept https requests toward github.com and append some data
     * 截获github.com的https请求，再在最后加点文字

rule_sample/rule_assign_ip_address.js

@@ -1,13 +0,0 @@
-//sample : assign 127.0.0.1 to www.taobao.com
-
-module.exports = {
-
-    replaceRequestOption : function(req,option){
-        if(option.hostname == "www.taobao.com"){
-        	option.hostname = "127.0.0.1";
-        }
-
-        return option;
-    }
-
-};