Use a full YAML parser

YAML::Tiny (just as YAML too) fails to parse the following valid YAML pyyaml produces:

".*":
  "license": |-
    GPL-2
"debian/":
  "copyright": "Clint Adams <clint@debian.org>\n Joey Hess <joeyh@debian.org>\n Marc\
    \ Singer <elf@debian.org>\n Per Andersson <avtobiff@gmail.com>\n Vagrant Cascadian\
    \ <vagrant@debian.org>\n Lo\xEFc Minier <lool@debian.org>\n Adam Borowski <kilobyte@angband.pl>"
  "license": |-
    GPL-2+

YAML::XS uses libyaml and parses this just fine.