clean up rdf2jsonld script

now it relies directly on the appassembler derived script, which works
natively as long as you run mvn clean install first

also add instruction to add execute permissions to all of the
appassembler scripts, per the stubbornness of the appassembler team
about implementing that feature themselves: 
http://jira.codehaus.org/browse/MAPPASM-54

Author: ansell

rdf2jsonld

@@ -3,8 +3,8 @@
 # The following commands are required to be run before this can be used (left out of the script itself
 # because they can take a while to run):
 #     chmod +x rdf2jsonld
-# 	  mvn -quiet compile
-#	  mvn -quiet dependency:build-classpath -Dmdep.outputFile=tools/target/cp.txt
+#     chmod +x tools/target/appassembler/bin/*
+# 	  mvn -quiet install
 # run ./rdf2jsonld for the usage
 
-java -cp tools/target/classes:`cat tools/target/cp.txt` de.dfki.km.json.jsonld.tools.RDF2JSONLD $@
+tools/target/appassembler/bin/rdf2jsonld