Topic/20130209 docs

A few doc clarifications.

Also, I fixed:

    Can't locate object method "rmtree" via package "Path::Tiny" at /Users/ether/perl5/perlbrew/perls/perl-5.16.2/lib/site_perl/5.16.2/Dist/Zilla/App/Command/xtest.pm line 69.

One more thing - your pod generation is f00ked - see the results of a dzil build, or look at https://metacpan.org/module/Dist::Zilla::Plugin::RunExtraTests (the C<> tags have been html-escaped).