Add http.Agent to node.js typings

node/node-tests.ts

@@ -154,6 +154,15 @@ module http_tests {
     var code = 100;
     var codeMessage = http.STATUS_CODES['400'];
     var codeMessage = http.STATUS_CODES[400];
+	
+	var agent: http.Agent = new http.Agent({
+		keepAlive: true,
+		keepAliveMsecs: 10000,
+		maxSockets: Infinity,
+		maxFreeSockets: 256
+	});
+	
+	var agent: http.Agent = http.globalAgent;
 }
 
 ////////////////////////////////////////////////////