fix for dokku #482 to handle setting config variables with spaces
fix for dokku #482 to handle setting config variables with spaces

(cherry picked from commit 4117ba8987e5086870f0bbcc88451013e79b5930)

fkowal/dokku,fkowal/dokku,fkowal/dokku,fkowal/dokku,fkowal/dokku,fkowal/dokku,fkowal/dokku