Refactor config variable names so they're grouped alphabetically
Refactor config variable names so they're grouped alphabetically

franela/play-with-docker,play-with-docker/play-with-docker,play-with-docker/play-with-docker,franela/play-with-docker,franela/play-with-docker,play-with-docker/play-with-docker,play-with-docker/play-with-docker,franela/play-with-docker