Perl example added

I'm writing Perl support for BlinkyTape. I expect to relese the Perl module to CPAN (the Perl module distribution center) during July. It is already available at  https://github.com/okko/perl-Device-BlinkyTape. This example shows how to use it.

The Perl Module comes with a simulation module that will display a simulated BlinkyTape on the OS X screen. This way development is possible before getting the actual device.