Add specialized overloads for request events

request/request-tests.ts

@@ -640,3 +640,15 @@ request({url: 'http://www.google.com', jar: j}, function () {
   var cookies = j.getCookies(url);
   // [{key: 'key1', value: 'value1', domain: "www.google.com", ...}, ...]
 });
+
+request(
+    { method: 'GET'
+    , uri: 'http://www.google.com'
+    , gzip: true
+    }
+  )
+  .on('request', function(req: http.ClientRequest) { })
+  .on('response', function(resp: http.IncomingMessage) { })
+  .on('data', function(data: Buffer | string) { })
+  .on('error', function(e: Error) { })
+  .on('complete', function(resp: http.IncomingMessage, body?: string | Buffer) { });