Fixed bug in create command

Fixed the error in the create command that wasn't allowing the creation of new MariaDB instances.
Merge pull request #30 from asyriqueat/patch-1

Fixed bug in create command
Latest dockerfiles submodule
Merge pull request #27 from neam/dockerfiles-as-submodule

Dockerfiles as submodule
Merge branch 'master' of https://github.com/Kloadut/dokku-md-plugin
Latest dockerfiles submodule
Preventing error "/bin/bash: exit 0: No such file or directory"