Start a package for entity attribute processing.
Interface and implementation of entity attribute context.
Implement entity category matchers.
Set snapshot version number (late).
Complete EntityAttributeFilteringStage implementation.
Unit tests for EntityAttributeFilteringStage.
Javadoc fix.
Add RegistrationAuthorityMatcher.
Add whitelisting/blacklisting to EntityAttributeFilteringStage.
Add some constraints.
Add MultiPredicateMatcher.

Allows matching entity attribute contexts through a combination of
predicates applied to the context components. This allows simple
matching against, for example, regular expressions.
Refactor matcher implementations.
Merge Entity Attribute filtering into 0.9pre