Add replace error handler
Add replace error handler

If the export is configured to happen f.e. in latin-1 (through setting
FORM_DESIGNER_EXPORT = {'encoding': 'latin-1'}), we need a different
error handler than 'strict' when encoding unicode strings.

Conflicts:

	form_designer/admin.py

michaelkuty/form_designer,feincms/form_designer,feincms/form_designer,michaelkuty/form_designer,michaelkuty/form_designer