Indicate success/failure in PySpark test script.

python/run-tests

@@ -3,7 +3,24 @@
 # Figure out where the Scala framework is installed
 FWDIR="$(cd `dirname $0`; cd ../; pwd)"
 
+FAILED=0
+
 $FWDIR/pyspark pyspark/rdd.py
+FAILED=$(($?||$FAILED))
+
 $FWDIR/pyspark -m doctest pyspark/broadcast.py
+FAILED=$(($?||$FAILED))
+
+if [[ $FAILED != 0 ]]; then
+    echo -en "\033[31m"  # Red
+    echo "Had test failures; see logs."
+    echo -en "\033[0m"  # No color
+    exit -1
+else
+    echo -en "\033[32m"  # Green
+    echo "Tests passed."
+    echo -en "\033[0m"  # No color
+fi
 
 # TODO: in the long-run, it would be nice to use a test runner like `nose`.
+# The doctest fixtures are the current barrier to doing this.