Improve create_pdfs summary report

* Add course id, long org and long course to the summary report, making it more useful
* Change csv_writer to use writerows() instead of writerow(), which is a little bit faster
* Changes from QUOTE_MINIMAL to QUOTE_ALL, so we can make safer assumptions in the future

To really see the value in this, make a branch with #30 and #31 applied, and this, and then run create_pdfs using a cert-data.yml file that has several dozen courses in it and using the -r flag. Then compare that output to running the same set of courses without this branch but with the -r flag.

@stvstnfrd I expect this will be uncontroversial.