no longer using [Test::CheckDeps]

This test is now generally frowned upon. See Perl-Toolchain-Gang/CPAN-Meta #38
Test::Mojibake is not one of the exceptions
use RunExtraTests first before the installtools, so xt/ runs first
fix badly-minted Changes file; can eliminate one bit of templating here
t/00-compile.t -> xt/author/00-compile.t
verify prereqs noisily but not fatally in t/00-report-prereqs.t
generate a CONTRIBUTING file, tailored to the dist (text heavily borrowed from @DAGOLDEN)
clarify why we parse META.json rather than doing $tzil->distmeta
add the current installed version of the bundle as a develop recommends (as a way of telling what version was used to build the dist)
Dist-Zilla-PluginBundle-Author-ETHER-0.029

          - dropped [Test::CheckDeps]
          - xt/ tests are now run before t/
          - compile test now generated as xt/author/00-compile.t
          - prereqs are noisly, but non-fatally, verified in
            t/00-report-prereqs.t
          - now generating a custom CONTRIBUTING file