Some improvements around ConfigurationSource:
The documentation of Configuration#getConfigurationSource() should say that the method returns null if there is no user-provided configuration (validation.xml).
ConfigurationSource#getConstraintMappingResourcePath() should be renamed to getConstraintMappingResourcePath
In spec section 5.5.3 a note on the configuration source is missing within the enumeration of Configuration features
Hardy, I think we can close this issue, right?