Fix problem communicating with ISI WoK SOAP service #215
The ISI WoK WSDL defines operations (like "authenticate") like this:

    <wsdl:operation name="authenticate">
      <soap:operation soapAction="" style="document"/>

But SOAP::Lite by default sends a SOAPAction header like this:

SOAPAction: "http://auth.cxf.wokmws.thomsonreuters.com#authenticate"

It seems that some SOAP servers don't like this, see for example anecdotal evidence here:
http://stackoverflow.com/questions/13902874/apache-cxf-the-given-soapaction-does-not-match-an-operation

Removing the SOAPAction header fixed the problem.
Merge branch '3.3' of github.com:eprints/eprints into 3.3