Add description to XS test
Don't pass unnecessary options to TAP::Harness
Add --jobs argument to MBT
dzil: list Dist::Zilla::Plugin::BuildSelf explicitely

To make 'dzil authordeps | cpanm' work (which means listing every plugin
necessary to at least be able to run 'dzil listdeps --author'), we add
Dist::Zilla::Plugin::BuildSelf as an '; authordep' line in dist.ini.

The alternative would be to add Dist::Zilla::Plugin::BuildSelf as a hard
dependency of Dist::Zilla::PluginBundle::LEONT, but using BuildSelf is
quite infrequent.
Add xs directory to include list

This way, it will not only care less about where ppport.h is located,
but will also allow header files to include in lib/<whatever>
v0.036

          Add --jobs argument to MBT
          Add xs directory to include list