Only check for repl classes if the user is running the repl. Otherwise,

check for core classes in run. This fixed the problem that core tests
depend on whether repl module is compiled or not.

run

@@ -102,12 +102,18 @@ STREAMING_DIR="$FWDIR/streaming"
 PYSPARK_DIR="$FWDIR/python"
 
 # Exit if the user hasn't compiled Spark
-if [ ! -e "$REPL_DIR/target" ]; then
-  echo "Failed to find Spark classes in $REPL_DIR/target" >&2
+if [ ! -e "$CORE_DIR/target" ]; then
+  echo "Failed to find Spark classes in $CORE_DIR/target" >&2
   echo "You need to compile Spark before running this program" >&2
   exit 1
 fi
 
+if [[ "$@" = *repl* && ! -e "$REPL_DIR/target" ]]; then
+  echo "Failed to find Spark classes in $REPL_DIR/target" >&2
+  echo "You need to compile Spark repl module before running this program" >&2
+  exit 1
+fi
+
 # Build up classpath
 CLASSPATH="$SPARK_CLASSPATH"
 CLASSPATH="$CLASSPATH:$FWDIR/conf"