Pass extra arguments to run-tests down to ./manage.py test invocations

This is particularly useful so that you can do:

    ./run-tests --keepdb

... to speed up running your tests locally.

run-tests

@@ -22,8 +22,8 @@ TEST_SETTINGS_MODULES=(
 for TEST_SETTINGS_MODULE in "${TEST_SETTINGS_MODULES[@]}"
 do
     COMMAND="./manage.py test --settings=$TEST_SETTINGS_MODULE"
-    echo Running: $COMMAND
-    $COMMAND
+    echo Running: $COMMAND "$@"
+    $COMMAND "$@"
     update_exit_code
 done