[fix] CTRL+C should shut down all workers.

[fix] Always calculate the established
[fix] Metrics always rerturns `this`

bin/thor

@@ -169,7 +169,13 @@ async.forEach(cli.args, function forEach(url, done) {
 
 console.log('');
 
-process.once('SIGINT', process.exit.bind(process, 0));
+process.once('SIGINT', function end() {
+  robin.forEach(function nuke(worker) {
+    try { worker.send({ shutdown: true }); }
+    catch (e) {}
+  })
+});
+
 process.once('exit', function summary() {
-  metrics.stop().summary();
+  metrics.established().stop().summary();
 });

metrics.js

@@ -60,8 +60,11 @@ Metrics.prototype.stop = function stop() {
  * @api public
  */
 Metrics.prototype.established = function established() {
+  if (this.timing.established) return this;
+
   this.timing.ready = Date.now();
   this.timing.established = this.timing.ready - this.timing.start;
+  return this;
 };
 
 /**
@@ -247,6 +250,8 @@ Metrics.prototype.summary = function summary() {
       results.writeRow([this.errors[err] +'x', err]);
     }, this);
   }
+
+  return this;
 };
 
 //