Django-easy-select2

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- Python 3.3 support, thanks to *dzerrenner*

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- Rendering select2attrs as unicode or json based on type

Now, if select2attrs is instance of basestring (str or unicode),
it will be casted to unicode, else it will be turned to json string.

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- Extended package-level imports with Select2TextInput

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- added Select2TextInput, thanks to *mkoistinen*

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- issue1 fix (django-admin-sortable compatibility), thanks to mkoistinen