Contributing jax.js
Let's have a README!
Update jax.js

Adding support for headers and fallback to old API.

GET(url, [headers,] cb);
DELETE(url, [headers,] cb);
PUT(url, args, [headers,] cb);
POST(url, args, [headers,] cb);

Yup, args are not optional: let's just be RESTful here and assume users WILL send args on a POST/PUT.
Update jax.js

Typo happens.
Merge pull request #1 from joshleaves/master

Adding jax for xhr features