fix(debug): make new debug work on windows too

Closes #580

Author: juliemr

Diff for: lib/runner.js

@@ -19,11 +19,12 @@ var Runner = function(config) {
   this.config_ = config;
 
   if (config.v8Debug) {
-    process.kill(process.pid, 'SIGUSR1');
+    // Call this private function instead of sending SIGUSR1 because Windows.
+    process._debugProcess(process.pid);
   }
 
   if (config.nodeDebug) {
-    process.kill(process.pid, 'SIGUSR1');
+    process._debugProcess(process.pid);
     var flow = webdriver.promise.controlFlow();
 
     flow.execute(function() {