Changing ProductQueryServlet to rename zip attachments with ".zip" extension, and allowing for convention to be overridden by subclasses.

git-svn-id: https://svn.apache.org/repos/asf/oodt/trunk@1576312 13f79535-47bb-0310-9956-ffa450edef68
Updating CHANGES.txt

git-svn-id: https://svn.apache.org/repos/asf/oodt/trunk@1576314 13f79535-47bb-0310-9956-ffa450edef68