persistent ids some thoughts

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+
+document types, filters, and transformations should define their own persistent ids. 
+
+Refactoring:
+* Id should become a String type.
+* Document type, filter, and transoformation should extend   Identifiable interface which defines Id<T> getId();
+* Id should be used in the config class to create the actual id. Id should no longer be returned.
+* deal with duplicate ids (runtime exception). 
+* unique ids at the xmlrouter level based on RouterConfig id. 
+
+
+* add new interface  with method updateConfig(RouterConfig) by which a service updates it's own part of the router config.
+* add copying of the RouterConfig. 
+* efficiently check for modifications based on the id. 
+