Fix input fields with multiple enabled:

- req.files[fieldname] is an Object when no multiple files are sent in the same field.
- req.files[fieldname] is an Array of Objects when multiple files are sent for fieldname.

fix problem  in firefox with empty file upload

Removed coffeescript completely. Added test directory with sample express app. TODO: write proper unit tests

Adding streamifier to make buffer into a stream - Closes #2