An invalid control file is generated, when the `name` contains special
characters.
Merge pull request #126 from muuki88/wip/debian-control-packagename

Debian Control File - Invalid package name
Fixed missing user name when checking if a user already exists
Merge pull request #128 from hindsightsoftware/user-exists-error

Checking if a user already exists during postinstall is missing the user name to check for