#3 dir_iter improvments

[Guria]

Apps uses dir_iter module (including file_browser.py) shows that folder is empty if it contains file or folders named with non-ascii characters.
For correct work it's enough to change one string in dir_iter.py.
old:
return (unicode(name_field), unicode(info_field))
new:
return (unicode(name_field, encoding='utf-8', errors='replace'), unicode(info_field, encoding='utf-8', errors='replace'))

[Guria]

Corrected dir_iter module

[zanac]

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Thanks!