Merge pull request #75 in ZP/z-push from bugfix/ZP-729-attachments-of-signed-emails-are-not to develop

* commit '438d30f8':
  ZP-729 Attachments of signed emails are not available on Android 6.
  ZP-729 Renamed parseSmime to ParseSmime to match the code style.
  ZP-729 Attachments of signed emails are not available on Android 6.