guzzle/guzzle — pull request #734 by mtdowling (2014-07-15 22:52:08+00:00)
Title: Lots of fixes to multipart/form-data

Using the AppendStream to vastly clean up how a multipart POST is created.
This changes also cleans up how the body is sent over the wire, eliminating
some bugs I discovered when fields are sent before files.