Using deprecated stdlib routines

[timeweaver]

Recent versions of stdlib have deprecated a bunch of validation routines
The cpan module is using at least one of these (validate_bool)

Error 500 on SERVER: Server Error: Evaluation Error: Unknown function: 'validate_bool'. (file: /etc/puppetlabs/code/environments/production/modules/cpan/manifests/init.pp, line: 54, column: 3)

[jstewart612]

#67 should address if repo maintainers approve and merge it

[timeweaver]

Bad news, validate_legacy is has also gone away in the latest release.

[isbear]

I created a pull request, that replaces all validate_* with class parameter types.