Metadata for xenial-updates/main

Stephen McConnel <stephen_mcconnel@sil.org>

Neil Mayhew <neil_mayhew@sil.org>

• fieldworks-applications 
  • fieldworks-te.desktop - 8.3.13~nightly20180409.071726.220.b21ba2b.hotfix+xenial1
  • fieldworks-flex.desktop - 8.3.13~nightly20180409.071726.220.b21ba2b.hotfix+xenial1