Make sure files are closed before deleting

[ajkiessl]

Some of our imports temporarily store a file while running. The #clear_tmp_files method in app/jobs/application_job is designed to clear out these tmp files before and after the integrations run. If there's an error while an integration is running, there's the chance the temporarily stored file is still open. So when we go to delete the file we get this error:

 Device or resource busy @ apply2files

We should make sure the file to be deleted is closed before deleting with something like this:

 f.close unless f.nil? or f.closed?

There may be instances other than #clear_tmp_files where temporary files are deleted. We should do the same there.