FELIX-2974 & FELIX-4211:

- marked only a bare minimum of packages as optional import;
- aligned the import/exports for all bundles [FELIX-2974];
- exported the Jetty packages for easier reuse of existing 
  functionality, such as GZip-filters [FELIX-4211].



git-svn-id: https://svn.apache.org/repos/asf/felix/trunk@1567618 13f79535-47bb-0310-9956-ffa450edef68