add Event support to file-fetch

index.js.patch

--- /home/eric/checkouts/linkeddata/rabel/node_modules/file-fetch/index-orig.js	2017-10-30 06:33:39.254504474 -0400
+++ /home/eric/checkouts/linkeddata/rabel/node_modules/file-fetch/index.js	2017-10-30 08:20:25.020709986 -0400
@@ -57,6 +57,30 @@
   }
 }
 
+const util = require('util')
+const EventEmitter = require('events')
+function send (options) {
+  if (!(this instanceof send))
+    return new send(options);
+  let self = this
+  self.path = options.path
+  this.end = function () {
+    this.finished = true
+    this.emit('finish')
+    setTimeout(() => {
+      setTimeout(() => {
+        self.emit('socket', null)
+        setTimeout(() => {
+          var stream = fs.createReadStream(self.path, {bufferSize: 64 * 1024})
+          self.emit('response', stream)
+        }, 0)
+      }, 0)
+    })
+  }
+}
+util.inherits(send, EventEmitter)
+fetch.request = send
+
 fetch.Headers = Headers
 
 module.exports = fetch