2.1.0

In response to issue #4, version 2.0.2 used Snakeyaml to resolve Yaml anchors and aliases. The resulting structure was then transformed back to Yaml and parsed with Jackson, the parser also used in 2.0.0 and 2.0.1, to avoid rewriting a parser from scratch. However, this introduced wrong line numbers in error messages since Yaml files were parsed twice.
Hence, version 2.1.0 changed the parser from Jackson to Snakeyaml.
Furthermore, error messages during parsing were also reworked and now show some context to an error and the actual error.