Unpin java tutorials

Author: majek

Makefile

@@ -66,7 +66,7 @@ clean::
 (cd erlang && \
 rm -rf .ok *.ez amqp_client* rabbit_common*)
 
-JVER=2.4.1
+JVER=$(RABBITVER)
 java/.ok:
 (cd java && \
 wget -c $(R)/rabbitmq-java-client/v$(JVER)/rabbitmq-java-client-bin-$(JVER).zip && \