Continue Feature work: complete DefaultFeatureType based on the DefaultParameterDescriptor experience.
Despite the API being intentionally similar, there is no relationship between those two classes because
they are different concepts.


git-svn-id: https://svn.apache.org/repos/asf/sis/branches/JDK7@1574667 13f79535-47bb-0310-9956-ffa450edef68