Django-popupcrud

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* Make formset alignment consistent with bootstrap3 settings
horizontal_label_class & horizontal_field_class.

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* Add formset support in CRUD create/update views
* Add size option to bsmodal template tags
* Fixes to some minor bugs

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* Add custom item action support
* Clean up JavaScript by encapsulating all methods in its own namespace &
reducing code duplication
* Add missing CSS styles to popupcrud.css
* Empty_list_message class variable now allows embedded html tags (value is
wrapped in mark_safe() before placing in template context)

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* Fix an issue where when form with errors is rendered select2 and add-related
widgets are not bound correctly

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* Breadcrumbs support
* ListView queryset custom filtering through ``PopupCrudViewSet.get_queryset()``
* Support custom form init args through ``PopupCrudViewSet.get_form_kwargs()``
* ``PopupCrudViewSet.new_url`` and ``PopupCrudViewSet.list_url`` are determined
through ``PopupCrudViewSet.get_new_url()`` and
``PopupCrudViewSet.get_list_url()`` throughout the code.

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* Use custom style for empty-list-state icon sizing. Earlier code was using font
awesome style.