Use unicode base path; fixes https://sourceforge.net/p/pywikipediabot/bugs/1648/

execfile does not accept unicode paths, so a manual exec open(...).read()
will have to take its job.

Change-Id: I9741c9f97e5a66f0d1af012a82f933f493c64066
Merge "Use unicode base path; fixes https://sourceforge.net/p/pywikipediabot/bugs/1648/"