v0.2.1

In addition to features from the validation library that was part of Griddle 0.2.0, version 0.2.1 of the gdl-validation library has the following improvements:

• Now a separate project and repository. Versioning may diverge in the future.
• Now published to Maven Central, under the organization "net.alloyggp" and module "gdl-validation". This is the recommended way to consume this library, to avoid having to add the java-cup 11b runtime library manually.

Note: Previously noted improvements to the parsing and validation logic were not in fact included in this release. They will be included in another release shortly.