OpenSlides/OpenSlides — pull request #1054 by andkit (2013-11-12 22:10:07+00:00)
Title: Fix unicode errors when getting static files (fixes #1034)

Fixes two issues with non-ascii paths:
- the "root" of the static handler must be unicode, otherwise unicode
strings will be mixed with non-ascii byte strings leading to
exceptions

- work around tornados rather naive implementation of tornados
validate_absolute_path