Feature Request: DJVu Support

[GoogleCodeExporter]

Your model / PRS+ version?

500 (upgraded) / all
350 / all

What steps will reproduce the problem?
1. Load DJVu file onto device.

What is the expected output? What do you see instead?
I'd like to see the DJVu file displayed. Instead, it isn't recognized. DJVu 
support would be a huge help, as many books are available from archive.org in 
this format (as well as it being the only compact format useful for 
mathematical texts).

Original issue reported on code.google.com by [email protected] on 13 May 2014 at 5:14