New plugin: Travis::TestRelease!

Also, move many of the git helpers into Dist::Zilla::Util::Git::Bundle
Many additions/fixes for TravisYML:

* Add support_builddir attr for dual DZIL+build YAMLs
* Add support for "allowed to fail" Perl versions
* Re-enable Perl 5.8 as an allowed to fail version
* Add separate perl_version_build attr (#8)
* Add dzil_branch attr
* Add new phases: after_install & after_deploy
* Turn on Fast Finish
Write post-failure comment for #11
Fix ChainSmoking.pm
"Chain smoking for local branch master"
Release v1.10