tag a class as a runnable application

 MooseX::Runnable is a framework
 for making classes runnable applications.
 This role doesn't do anything
 other than tell the rest of the framework
 that your class is a runnable application
 that has a run method which accepts arguments
 and returns the process' exit code.
 .
 This is a convention that the community has been using for a while.
 This role tells the computer that your class uses this convention,
 and let's the computer abstract away
 some of the tedium this entails.