Removed unnecessary headers and always add "X-Content-Type-Options: nosniff".
Always add the "X-Content-Type-Options: nosniff" header.
Merge branch 'master' into gh-pages
Clarify the importance of the "X-Content-Type-Options: nosniff" header. Closes #2414

Add the "Content-Disposition: attachment" header.
Updated package version.
Merge branch 'master' into gh-pages