Updated the files.

my-app/node_modules/xhr2/src/progress_event.coffee

@@ -0,0 +1,39 @@
+# http://xhr.spec.whatwg.org/#interface-progressevent
+class ProgressEvent
+  # Creates a new event.
+  #
+  # @param {String} type the event type, e.g. 'readystatechange'; must be
+  #   lowercased
+  constructor: (@type) ->
+    @target = null
+    @currentTarget = null
+    @lengthComputable = false
+    @loaded = 0
+    @total = 0
+    # Getting the time from the OS is expensive, skip on that for now.
+    # @timeStamp = Date.now()
+
+  # @property {Boolean} for compatibility with DOM events
+  bubbles: false
+
+  # @property {Boolean} for fompatibility with DOM events
+  cancelable: false
+
+  # @property {XMLHttpRequest} the request that caused this event
+  target: null
+
+  # @property {Number} number of bytes that have already been downloaded or
+  #   uploaded
+  loaded: null
+
+  # @property {Boolean} true if the Content-Length response header is available
+  #   and the value of the event's total property is meaningful
+  lengthComputable: null
+
+  # @property {Number} number of bytes that will be downloaded or uploaded by
+  #   the request that fired the event
+  total: null
+
+
+# The XHR spec exports the ProgressEvent constructor.
+XMLHttpRequest.ProgressEvent = ProgressEvent