Clean up extra directories when we're done with them
If a runner is re-used, the presence of `TMP_DIR` will cause the script to fail. To be safe, we'll also remove `SVN_DIR` to prevent conflicts, even though the directories are timestamped. Fixes #6
If a runner is re-used, the presence of `TMP_DIR` will cause the script to fail. To be safe, we'll also remove `SVN_DIR` to prevent conflicts, even though the directories are timestamped. Fixes #6