Set default python encoding to utf-8

As spoted by Daniel Narvaez in [1], pygi does not set the default encoding
anymore as the old GTK+ did. This change does break activities ported
to GTK+3.

The change in GTK+ has been discussed upstream here [2].

A better solution will be implemented when we port to Python 3,
when we will be able to use real unicode strings.

Signed-off-by: Gonzalo Odiard <gonzalo@laptop.org>
Acked-by: Simon Schampijer <simon@laptop.org>

[1] http://lists.sugarlabs.org/archive/sugar-devel/2012-August/038993.html
[2] https://bugzilla.gnome.org/show_bug.cgi?id=681915

bin/sugar-activity

@@ -18,6 +18,12 @@
 
 import os
 import sys
+
+# Change the default encoding to avoid UnicodeDecodeError
+# http://lists.sugarlabs.org/archive/sugar-devel/2012-August/038928.html
+reload(sys)
+sys.setdefaultencoding('utf-8')
+
 import gettext
 from optparse import OptionParser