* Feature: Added the `on_stats` request option to provide access to transfer
  statistics for requests. https://github.com/guzzle/guzzle/pull/1202
* Feature: Added the ability to persist session cookies in CookieJars.
  https://github.com/guzzle/guzzle/pull/1195
* Feature: Some compatibility updates for Google APP Engine
  https://github.com/guzzle/guzzle/pull/1216
* Feature: Added support for NO_PROXY to prevent the use of a proxy based on
  a simple set of rules. https://github.com/guzzle/guzzle/pull/1197
* Feature: Cookies can now contain square brackets.
  https://github.com/guzzle/guzzle/pull/1237
* Bug fix: Now correctly parsing `=` inside of quotes in Cookies.
  https://github.com/guzzle/guzzle/pull/1232
* Bug fix: Cusotm cURL options now correctly override curl options of the
  same name. https://github.com/guzzle/guzzle/pull/1221
* Bug fix: Content-Type header is now added when using an explicitly provided
  multipart body. https://github.com/guzzle/guzzle/pull/1218
* Bug fix: Now ignoring Set-Cookie headers that have no name.
* Bug fix: Reason phrase is no longer cast to an int in some cases in the
  cURL handler. https://github.com/guzzle/guzzle/pull/1187
* Bug fix: Remove the Authorization header when redirecting if the Host
  header changes. https://github.com/guzzle/guzzle/pull/1207
* Bug fix: Cookie path matching fixes
  https://github.com/guzzle/guzzle/issues/1129
* Bug fix: Fixing the cURL `body_as_string` setting
  https://github.com/guzzle/guzzle/pull/1201
* Bug fix: quotes are no longer stripped when parsing cookies.
  https://github.com/guzzle/guzzle/issues/1172
* Bug fix: `form_params` and `query` now always uses the `&` separator.
  https://github.com/guzzle/guzzle/pull/1163
* Bug fix: Adding a Content-Length to PHP stream wrapper requests if not set.
  https://github.com/guzzle/guzzle/pull/1189
