Fixed #1258: Py3 incompatability with datamigration command
utils.py3: added import of `StringIO` from `io` or `cStringIO` depending on `PY3`

--HG--
branch : python3
migration.migrators: replaced import logic for `StringIO` with `utils.py3`

--HG--
branch : python3
Merged in eligemejor/south/python3 (pull request #139)

Replace import logic for `StringIO` with `utils.py3`
Branch merge
Version bump
Added tag 0.8.2 for changeset ba0e66e46c89
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