Add test cases for the proxy, and do some tiny fixes.

the fixes are:
1. add "content-type" in headers for when dealing with localresponse
2. make a more accurate tip for throttle rate when lower than 1
3. make the crtMgr funcionality a more independent one
4. uppercase the request header before sending it out

update the tip

lib/rule_default.js

@@ -73,6 +73,7 @@ setTimeout(function(){
 
 
 module.exports = {
+    token: Date.now(),
     summary:function(){
         var tip = "the default rule for AnyProxy.";
         if(!isRootCAFileExists){
@@ -102,7 +103,10 @@ module.exports = {
                 if(err){
                     callback(200, {}, "[AnyProxy failed to load local file] " + err);
                 }else{
-                    callback(200, {}, buffer);
+                    var header = {
+                        'Content-Type': utils.contentType(req.anyproxy_map_local)
+                    };
+                    callback(200, header, buffer);
                 }
             });
         }