Added tests for 'toString()' implementation.


git-svn-id: https://svn.apache.org/repos/asf/sis/branches/JDK8@1594959 13f79535-47bb-0310-9956-ffa450edef68
Renamed 'properties(boolean)' as 'getProperties(boolean)' and 'superTypes()' as 'getSuperTypes()'
for consistency with other feature classes, and also for analogy with java.lang.Class.


git-svn-id: https://svn.apache.org/repos/asf/sis/branches/JDK8@1594961 13f79535-47bb-0310-9956-ffa450edef68