making ::files::install a subclass doesn't work.

it tries to load a ConfigData.pm that does not exist.

twin% ./Build test
t/00-use.t .. ok
t/eud.t ..... Can't locate Acme/Alien/DontPanic/Install/Files/ConfigData.pm in @INC (you may need to install the Acme::Alien::DontPanic::Install::Files::ConfigData module) (@INC contains: /home/ollisg/dev/Alien-Base-Extras/Acme-Alien-DontPanic/blib/lib /home/ollisg/dev/Alien-Base-Extras/Acme-Alien-DontPanic/blib/arch /home/ollisg/.perlbrew/libs/perl-5.20.0@dev/lib/perl5/x86_64-linux /home/ollisg/.perlbrew/libs/perl-5.20.0@dev/lib/perl5/x86_64-linux /home/ollisg/.perlbrew/libs/perl-5.20.0@dev/lib/perl5 /home/ollisg/.perlbrew/libs/perl-5.20.0@dev/lib/perl5/x86_64-linux /home/ollisg/.perlbrew/libs/perl-5.20.0@dev/lib/perl5 /home/ollisg/perl5/perlbrew/perls/perl-5.20.0/lib/site_perl/5.20.0/x86_64-linux /home/ollisg/perl5/perlbrew/perls/perl-5.20.0/lib/site_perl/5.20.0 /home/ollisg/perl5/perlbrew/perls/perl-5.20.0/lib/5.20.0/x86_64-linux /home/ollisg/perl5/perlbrew/perls/perl-5.20.0/lib/5.20.0 .) at (eval 25) line 2.
Can't locate object method "config" via package "Acme::Alien::DontPanic::Install::Files::ConfigData" at /home/ollisg/.perlbrew/libs/perl-5.20.0@dev/lib/perl5/Alien/Base.pm line 337.
BEGIN failed--compilation aborted at t/eud.t line 4.
t/eud.t ..... Dubious, test returned 2 (wstat 512, 0x200)