PEP8 all the things!
Send good headers, in correct format
Remove double quotes from filename as it's done by content_disposition_filename
Remove old unused arg from PDFTemplateResponse class
Move make_absolute_paths to utils so it can be used in tests
Fix tests and add new ones for show_content_in_browser feature
DRY on tests
Remove unwanted settings vars from test project
Merge pull request #28 from incuna/downloading-option

Make PDF downloading an option