Description of problem:
Setting up a name (firstname or surname) containing non-ascii characters in ~/.publican.cfg and using "publican add_revision" will result in broken encoding inserted as the revision creator's name into Revision_History.xml

Version-Release number of selected component (if applicable):
publican-3.1.5-0.fc17.t62.noarch

How reproducible: 100 %

Steps to Reproduce:
1. Add the following into your ~/.publican.cfg file:
   firstname: Petr
   surname: Bokoč
2. In any book's directory, run:
   $ publican add_revision --lang=en-US --member=foo
3. Inspect the Revision_History.xml file

Actual results:
Revision_History.xml has a new entry containing <surname>BokoÄ</surname>.

Expected results:
Revision_History.xml has a new entry containing <surname>Bokoč</surname>.

Additional info:
Overriding the the surname inside the actual command ($ publican add_revision --lang=en-US --member=foo --surname=Bokoč), the non-ascii character is inserted properly. The problem is isolated to the ~/.publican.cfg configuration file.