Add catherder heading as per mst's insistence
(travis) Cut the amount of threads we use in half

Hopefully this will stave off the out of memory issues
https://github.com/travis-ci/travis-ci/issues/2715
https://github.com/travis-ci/travis-ci/issues/2101
Forgotten manifest adjust after a2bd379666
Even though perl_5 should be valid in 1.4, CPANTS barfs

Work around https://github.com/Perl-Toolchain-Gang/CPAN-Meta/issues/68