Return a filehandle instead of PDF content [#3]

[robrwo]

This returns a filehandle instead of the actual content of the PDF.
It uses IO::File::WithPath so that the Plack XSendfile middleware
can work with HTTP servers that support X-Sendfile extensions to
have the PDF served directly by the web server.

[mc7244]

Thanks for the patch.
However, returning a file handle instead of the content would likely break compatibility with exsiting installation, so I'll likely modify it to accept a parameter, or write a second method.

[robrwo]

Any progress on this?

[mc7244]

I'm planning to integrate thin in the upcoming days.