Comment 1 for bug 1053053

This is a bug in py2app:
https://bitbucket.org/ronaldoussoren/py2app/issue/59/generated-app-is-writing-pyo-files-inside

Until that's fixed, a workaround is to run the app once and re-sign before distributing.
Fortunately, all the .pyo files that could be generated are generated on startup without doing anything in the app, so this is fast.