Merge pull request #160 from hashicorp/close_temp_file

make tmpFile close the newly created file in case a future task need to delete it

common.go

@@ -9,5 +9,6 @@ func tmpFile(dir, pattern string) (string, error) {
 	if err != nil {
 		return "", err
 	}
+	f.Close()
 	return f.Name(), nil
 }