* Bug fix: Proxy::wrapSync() now correctly proxies to the appropriate handler
  https://github.com/guzzle/guzzle/commit/911bcbc8b434adce64e223a6d1d14e9a8f63e4e4
* Feature: HandlerStack is now more generic.
  https://github.com/guzzle/guzzle/commit/f2102941331cda544745eedd97fc8fd46e1ee33e
* Bug fix: setting verify to false in the StreamHandler now disables peer
  verification. https://github.com/guzzle/guzzle/issues/1256
* Feature: Middleware now uses an exception factory, including more error
  context. https://github.com/guzzle/guzzle/pull/1282
* Feature: better support for disabled functions.
  https://github.com/guzzle/guzzle/pull/1287
* Bug fix: fixed regression where MockHandler was not using `sink`.
  https://github.com/guzzle/guzzle/pull/1292
