Fixing PROJECT_DIRS.

The reason you were getting the template error is because your PROJECT_DIRS setting was pointing to the folder called 'blog_system', this is not where it should be pointing.

If you look at your TEMPLATE_DIRS setting, it was trying to find your templates in the folder blog_system/templates/blah, when in reality, you wanted to load your templates from django-blog/templates/blah

What I did was modify your PROJECT_DIRS setting so that it points to the correct folder (django-blog), which then ended up making the project work (although, there may still be database errors -- I didn't test this on Heroku -- just locally).
Merge pull request #1 from rdegges/patch-1

Fixing PROJECT_DIRS.

Thanks!  :D