Added basic tests for Feature Associations.


git-svn-id: https://svn.apache.org/repos/asf/sis/branches/JDK8@1593858 13f79535-47bb-0310-9956-ffa450edef68
More efficient implementation of DefaultFeatureType.isAssignableFrom.
Document the fact that the check is based of type name only.


git-svn-id: https://svn.apache.org/repos/asf/sis/branches/JDK8@1593920 13f79535-47bb-0310-9956-ffa450edef68
Trivial formatting.


git-svn-id: https://svn.apache.org/repos/asf/sis/branches/JDK8@1593921 13f79535-47bb-0310-9956-ffa450edef68