Added JsonEncoder to flux commands

Author: cboehme

src/main/resources/flux-commands.properties

@@ -37,7 +37,7 @@ encode-literals org.culturegraph.mf.stream.converter.StreamLiteralFormater
 encode-cgentity org.culturegraph.mf.stream.converter.CGEntityEncoder
 encode-cgtext org.culturegraph.mf.stream.converter.CGTextEncoder
 encode-formeta org.culturegraph.mf.stream.converter.FormetaEncoder
-
+encode-json org.culturegraph.mf.stream.converter.JsonEncoder
 
 write	org.culturegraph.mf.stream.sink.ObjectWriter