Log Message:
Updated p5-YAML to 1.19.

1.19 Fri Nov 18 19:46:44 CET 2016
 - Apply PR/164 pod (link to YAML::Shell)
 - Apply PR/151 Fix infinite loop for aliases without a name @bubaflub++
 - Apply PR/142 Improve error messages @werekraken++
 - Apply PR/162 Improve error messages
 - Apply PR/163 Trailing spaces after inline seq/map work now
 - Apply PR/154 Add test case for trailing comments @Varadinsky++