fetch 0.4.0

• Align bodyUsed error message to Chrome's implementation
• Web Workers support
• Assign to self

fetch 0.3.2

• FormData should only able to consume once

fetch 0.3.1

• Reject promise with TypeError for network failures.

fetch 0.3.0

• Fix PUT/DELETE for IE 9 and PATCH for Node.js.
• Normalize capitalization of HTTP methods per fetch spec
• Fix sending requests with empty body such as DELETE in IE
• Fix promise being rejected on IE 9 when server response is invalid
• Fixes 204 No Content responses for IE 9
• Remove form encoded object body.

fetch 0.2.1

• Fixed uncaught error when a body was consumed more than once.

fetch 0.2.0

• Throw proper errors
• Allow body to be consumed a single time.
• Don't expose consumed function as public Body API.
• Parse form encoded response body.