Relax ProductReader to accept all token characters
Merge pull request #878 from jgustie/productreadertokenchar

Relax ProductReader to accept all token characters
      - Added Message#getHeaders() method to facilitate raw HTTP
        headers manipulation.
        Suggested by Robert Fischer, Jack Jones and others.
      - Continued integration of Restlet JAX-RS extension with RESTEasy.
      - Moved Header class to org.restlet.util package.
 - Fixed unit test due to random Java method introspection order
 - Turned off NIO connectors in test suite as they are not stable yet.
 - Moved Header class to org.restlet.data
For now I turned off Jetty in unit tests (client and server) due to pending issues with chunked encoding on client-side and HTTPS on server-side.
 - Added RESTEasy dependency
Fixed RESTEasy depd