NCBC-327: Update Nuspec files to current VS Solution Configuration

Change-Id: I0db8fc32b9581df50782717ba874b64268ef576b
Reviewed-on: http://review.couchbase.org/30141
Reviewed-by: Jeffry Morris <jeffrymorris@gmail.com>
Tested-by: Jeffry Morris <jeffrymorris@gmail.com>