[server/schemaserial] fix extra_props on py3k
json.dumps returns unicode, and json.load eats unicode, so add explicit
encoding/decoding.
Document: cubicweb-doc
Title: CubicWeb documentation
Author: Logilab
Abstract: Some base documentation for CubicWeb users and developpers
Section: Apps/Programming
Format: HTML
Index: /usr/share/doc/cubicweb-documentation/index.html
Files: /usr/share/doc/cubicweb-documentation/*.html