Add Cache Control HTTP header controls for REST APIs

Here are some of the options:

1. use explicit Response return objects for all CXF services, (probably intrusive).
2. use Servlet Filters to set Cache Control headers, (not ideal since too far separated from CXF service methods).
3. use CXF interceptors to set Cache Control headers
4. modify ServletDelegatingValve to include default Cache Control headers, (configured via Spring)
5. support custom annotations to specify caching parameters on service methods/classes.

Options 4 and 5 done together seem like best approach at this point.