fix repl helper

Author: Stuart Halloway

bin/repl

@@ -1,7 +1,9 @@
 #!/bin/bash
 # Note: First you must run mvn dependency:build-classpath -Dmdep.outputFile=bin/maven-classpath 
+set -e
+
 CLASSPATH=src/main/clojure:src/test/clojure:src/examples/clojure:`cat bin/maven-classpath`
 
-java -server -Xmx2GB $CTG_JAVA_OPTS -cp $CLASSPATH clojure.main "$@"
+java -server -Xmx2G $CTG_JAVA_OPTS -cp $CLASSPATH clojure.main "$@"