Django-concurrency

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* avoid to use concurrency when selecting all items (select_across)

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* Django 1.7 compatibility
* fixes typo in ``delete_selected_confirmation.html`` template
* python 3.2/3.3 compatibility

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* backward compatibility updates. Do not check for concurrency if `0` is passed as version value
(ie. no value provided by the form)

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* new :class:`concurrency.fields.TriggerVersionField`
* start using pytest
* moved tests outside main package
* new protocol see:ref:`protocols`
* it's now possible disable concurrency in Models that extends concurrency enabled models
* fixed :issue:`23` (thanks matklad)
* new :setting:`USE_SELECT_FOR_UPDATE`

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* new :ref:`disable_concurrency` context manager
* added documentation for :ref:`concurrency.middleware.ConcurrencyMiddleware <concurrencymiddleware>`
* **BACKWARD INCOMPATIBLE** Fixed typo: ``CONCURRECY_SANITY_CHECK`` now ``CONCURRENCY_SANITY_CHECK``
* added ``disable_sanity_check`` context manager
* added configuration
* check admin actions for concurrent deletion
* added concurrency check for admin's :ref:`list_editable`

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* python 3.x compatibility
* new :setting:`CONCURRENCY_FIELD_SIGNER`