Add Artistic License 2
Add Artistic License 2

The test suite comes originally from the Pugs repository, which used
Artistic License 2 by default, and community concensus seems to agree.

dankogai/roast,b2gills/roast,skids/roast,niner/roast,perl6/roast,b2gills/roast,niner/roast,skids/roast,dankogai/roast,cygx/roast,bitrauser/roast,cygx/roast,bitrauser/roast,dogbert17/roast,dogbert17/roast,laben/roast,niner/roast,zostay/roast,laben/roast,zostay/roast,skids/roast,zostay/roast,laben/roast,dankogai/roast,cygx/roast,b2gills/roast