BASE_DIR gets project's absolute path

Don't you mean something like this here? With the current BASE_DIR variable set to `os.path.dirname(os.path.dirname(__file__))`, I was getting an error while trying to include a default template located in *project_folder/templates*.

    TemplateDoesNotExist at /

I noticed this when I upgraded to 1.6, so it should probably be merged there too.