Issue #2368957 by mikispeed: Fixed Set class on MoreLink as array instead as string.
Issue #2369107 by lussoluca: Update Guzzle to 5.0.3.
Issue #2368739 by Wim Leers: Fixed user_page_attachments() unnecessarily adds an individual CSS file on every page.
Revert "Issue #2369107 by lussoluca: Update Guzzle to 5.0.3."

Temporary revert; CMF 1.3 is also ready and is a bigger PITA to re-roll.

This reverts commit d806a9bb87f7826a35f404a14e7eacffc45e79d9.