Lack of error handling while uploading a file.

If the network connection is lost (e.g. cable pulled), the node process will exit because of an error even that has no handler registered.

Need some fix like:

diff --git a/node_modules/gcloud/lib/storage/file.js b/node_modules/gcloud/lib/storage/file.js
index 8e1a26e..4aaec72 100644
--- a/node_modules/gcloud/lib/storage/file.js
+++ b/node_modules/gcloud/lib/storage/file.js
@@ -913,11 +915,20 @@

     var writeStream = request(reqOpts);
     writeStream.callback = util.noop;
-
+    var errorHandled = false;
+    writeStream.on('error', function(err) {
+      if (!errorHandled) {
+         errorHandled = true;
+         handleError(err);
+      }
+    });
     writeStream.on('complete', function(res) {
       util.handleResp(null, res, res.body, function(err, data) {
         if (err) {
-          handleError(err);
+          if (!errorHandled) {
+             errorHandled = true;
+             handleError(err);
+          }
           return;
         }