Address warnings from Django 1.11

[merwok]

These are the warnings when running with Django 1.11:

• Importing from django.core.urlresolvers is deprecated in favor of django.urls.
• Usage of ForeignObjectRel.to attribute has been deprecated. Use the model attribute instead.
• Usage of field.rel has been deprecated. Use field.remote_field instead.
• django.utils.translate.string_concat() is deprecated in favor of django.utils.text.format_lazy().
• permalink() is deprecated in favor of calling django.urls.reverse() in the decorated method.

I could see how simple_history handles compat (util module or try/excepts) and make a PR, but not until a few weeks.

[seocam]

Also

• Using user.is_authenticated() and user.is_anonymous() as a method is deprecated. Remove the parentheses to use it as an attribute.

[merwok]

PR #320 addresses some of the issues.

[rossmechanic]

Handled since we upgraded to 2.0

[merwok]

Great news!