v0.5.1

Bug Fixes

• client: don't close stream until EOF (a5e6174e, closes #543)

Features

• client: implement Default trait for client (be041d91)
• header: add ContentType::form_url_encoded() constructor (2c99d4e9)
• headers: return hyper::Error instead of () from header components (5d669399)
• http: add get_mut method to HttpReader (e64ce8c0)

Breaking Changes

• Error enum extended. Return type of header/shared/
  types changed.

  (5d669399)