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Merge pull request #378 from douglasmiranda/fix-empty-form

Fix empty form.
Add empty form fix to history.
Make sure that the urls.py is loaded before the tests are run. Django 1.6 doesn't guarantee this anymore. Part of a Fix for #387.
Django 1.6 changed the widgets its using for IntegerFields, this needed adjustment in the floppifying rule for those fields. Part of a Fix for #387.
Django 1.6 changed the MultiWidget.needs_multipart_form attribute into a property. We didn't plan for that in floppify code yet. We check now for properties which makes it compatible with Django 1.6 and more futureproof. Part of a Fix for #387.
Remove deprecated setup_environ call from the docs configuration script. That made the documentation building fail for Django 1.6. Part of a Fix for #387.
Better error messages for admin views that fail to instantiate.
Fixing failing tests, that only occured on Travis. You cannot use a plane, generic View in the Admin since it always needs to be a model based one. At least unless you overwrite the get_*_kwargs method.
Merge pull request #388 from gregmuellegger/django1.6fixes

Fixes for Django 1.6