Merge pull request #1 from dieterdemeyer/master

Initial draft version of proftpd module + define voor vhost ftp
Merge pull request #2 from dieterdemeyer/master

Fixes for ftp service + implemented ftp instance and adding/removing ftp users + Ability to provide uid and gid for ftp user
Merge pull request #3 from dieterdemeyer/master

Some fixes
Merge pull request #4 from dieterdemeyer/master

Fix for users file
Merge pull request #5 from dieterdemeyer/master

Different approach for adding/modifying ftp users
Merge pull request #6 from dieterdemeyer/master

Revert to avoid dependency cycle