[tiled/f17] (4 commits) ...Another try to get the sources file updated

[Erik Schilling]

Summary of changes:

  e39bb90... New upstream release 0.9.0 (*)
  ea07a74... Added new release tarball (*)
  570d1d0... Fixed forgetting to commit gitignore and sources file (*)
  bdfc540... Another try to get the sources file updated (*)

(*) This commit already existed in another branch; no separate mail sent