Package the gemspec file in the gem for tests.
Package the gemspec file in the gem for tests.

Yo dawg, I heard you like testing so I put a gemspec in your gemspec
so you can test the gem while you gem install.

Fixes #588

ohai/yard,alexdowad/yard,ohai/yard,alexdowad/yard,amclain/yard,thomthom/yard,thomthom/yard,herosky/yard,ohai/yard,lsegal/yard,amclain/yard,thomthom/yard,herosky/yard,lsegal/yard,lsegal/yard,iankronquist/yard,amclain/yard,jreinert/yard,alexdowad/yard,iankronquist/yard,herosky/yard,jreinert/yard,iankronquist/yard,jreinert/yard