Merge pull request #543 in ZP/z-push from bugfix/ZP-1230-windows-phone-8.1-unable-to-sync to develop

* commit '1691dff0':
  ZP-1230 Reverted change: Regexp faulty. Details in ticket comment.
  ZP-1230 Reverting change: newlines shouldn't matter in HTML.
  ZP-1230 Reverting change: ob_start() is not required at this point.
  ZP-1230 Reverting change: WBXMLEncoder->getBodypartsCount() is correct.
  ZP-1230 windows-phone-8.1-unable-to-sync. Released under the Affero GNU General Public License (AGPL) version 3.
  ZP-1230 windows-phone-8.1-unable-to-sync. Released under the Affero GNU General Public License (AGPL) version 3.
  ZP-1230 windows-phone-8.1-unable-to-sync. Released under the Affero GNU General Public License (AGPL) version 3. Fixed as described in Jira.