Added the underscore node_module.

node_modules/underscore/amd/_toBufferView.js

@@ -0,0 +1,15 @@
+define(['./_getByteLength'], function (_getByteLength) {
+
+  // Internal function to wrap or shallow-copy an ArrayBuffer,
+  // typed array or DataView to a new view, reusing the buffer.
+  function toBufferView(bufferSource) {
+    return new Uint8Array(
+      bufferSource.buffer || bufferSource,
+      bufferSource.byteOffset || 0,
+      _getByteLength(bufferSource)
+    );
+  }
+
+  return toBufferView;
+
+});