Adding the ability to specify default request options for every client request
Adding Guzzle\Common\Collection::setPath($path, $value)
Marking setDefaultHeaders() and getDefaultHeaders() as deprecated on a
Client.
Added the ability to provide flags when applying RequestFactory options.
This allows for things like applying options in a default manner so that
they do not overwrite existing values.
Marking CurlAuthPlugin as deprecated
Fixing typo