improve performance for large files

Using `buf = Buffer.concat([buf, data]);` on the data event copies the
data in a new larger buffer everytime. Instead, store the intermediate
small buffers in an array and concat only at the end.

Massive overhauls. Adding Travis C.I. build. FINALLY have testing!!! Added linting rules to keep the project clean.

v0.1.0 Beta: No more urlencoded support. Multipart only. Removed connect-busboy dependency in exchange for directly using Busboy. Updated README with breaking changes. This commit also fixes #11

Support arrays of fields (similar to busboy 'autoFields' option)

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