Update YAML::XS from 0.52 to 0.53

Changes:
0.53 Fri Nov 28 09:20:08 PST 2014
 - Fix for
   https://bitbucket.org/xi/libyaml/issue/10/wrapped-strings-cause-assert-f
   ailure
Update Dancer2 from 0.155000 to 0.155001

Changes:
0.155001  2014-11-28 17:42:24+01:00 Europe/Amsterdam
     [ BUG FIXES ]
     * Small typo in test. (Dávid Kovács)