Update org-trello's packaging composed of multiple files.
This duplicates org-trello's https://github.com/org-trello/org-trello/blob/master/Caskdefinition.

Tested against my fork ardumont/org-trello on dev branch 0.4.4
+ M-x package-install-file
Merge pull request #1712 from ardumont/org-trello-with-multiple-files-packaging

Update org-trello recipe