updated version of SnakeYAML to 1.13
Merge pull request #2139 from codingricky/upgrade-snakeyaml

updated version of SnakeYAML to 1.13
Anorm `?` parser should not hide type/sql mapping error, just ignore null/missing column.
Merge pull request #2142 from cchantep/anorm-optparser

Anorm `?` parser should not hide type/sql mapping error
Incorporated sbt-web concerns into Play in order to reduce the repetition for sbt-web plugin configuration