Merge pull request #246 from radarhere/rmdir

MRG: Remove temporary directory if empty

Clean up the temporary directory 'tmp_for_test' at the end of `install_run` if no files are left inside.

common_utils.sh

@@ -337,6 +337,7 @@ function install_run {
     install_wheel
     mkdir tmp_for_test
     (cd tmp_for_test && run_tests)
+    rmdir tmp_for_test 2>/dev/null
 }
 
 function fill_submodule {