Move toGenericNames to DefaultNameFactory, nail down tests to SIS name factory, and add javadoc.


git-svn-id: https://svn.apache.org/repos/asf/sis/branches/JDK8@1597967 13f79535-47bb-0310-9956-ffa450edef68
Added tests and documentation for the Names convenience class.


git-svn-id: https://svn.apache.org/repos/asf/sis/branches/JDK8@1597977 13f79535-47bb-0310-9956-ffa450edef68