Update 2013-06-23-09-30-tdd-oo-sps-case-study-fighting-drupal.md

Added slides to tdd-oo-sps-case-study-fighting-drupal session.
4K peeps, will you all be posting links to the videos here? or do we need to do that?
Merge pull request #23 from e2thex/master

slides for tdd-oo-sps-case-study-fighting-drupal