Export jcr/xml without binary contents by setting the parameter skitBinary

https://www.pivotaltracker.com/s/projects/684825/stories/74701156

When append the parameter skipBinary=true to the original fcr:export url like http://localhost:8080/rest/file/fcr:export?skipBinary=true, we can get the jcr/xml output with no binary contents now.  
I am manipulate to avoid adding another signature like serialize(final FedoraObject obj, final OutputStream out, boolean skipBinary) to the FedoraObjectSerializer interface for this special output at this time. But I think we can if this should be a more general support for other future formats that Fadora supports. 
Could you change this parameter to "recurse" with the same default of "false" (i.e. we do not want to recurse by default). Double negatives are sometimes confusing.