Fixed the MANIFEST.in file replacing / with space so that the manifest_maker sees dir pattern instead of dir/*.py
When running in debug mode with staticfiles enabled, the content-type of responses that are 304-Not Modified is deleted (by staticfiles) from the response headers.  The middleware was causing a 500 anytime a 304 was returned, now it will simply let the 304 pass thru
Merge pull request #14 from mark0978/master

Fix for Issue 13, Thanks you @mark0978