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
Merge pull request #32 from edx/jrbl/more_useful_report

Improve create_pdfs summary report