Django-easy-select2

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- fixed issue12 "Inline relations: "Add another <Model>" breaks dropdown boxes"

.. WARNING::

Version 1.2.9 introduced backward incompatible change:
`select2attrs` argument of `Select2Mixin.__init__` must be of type dict

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- fixed incorrect instructions in help_text of ManyToMany fields 2, thanks to *bashu*.

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- setup.py fixes (issue 11), thanks to *JensTimmerman*.

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- Extended select2_modelform function with `form_class` argument to
specify form base class explicitly (issue 10).

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- Fixed issue 9 "apply_select2 not imported in __init__" thanks to *ocZio* for bug report.

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- Fixed issue 6 "Select will not update selection after adding a new option",
thanks to *ismaelbej* for bug report.