Django 2.0 support

[vkurup]

This is mostly #190, with 1 commit added to add documentation and minor tox/travis configuration changes. There is one python warning remaining, which is probably best dealt with when we drop Django <1.11 support:

boundfield.py:41: RemovedInDjango21Warning: Add the `renderer` argument to the render() method of <class 'selectable.forms.widgets.AutoCompleteSelectMultipleWidget'>. It will be mandatory in Django 2.1.

:crossed_fingers: that this works on Travis (not sure if deadsnakes will work?)

[codecov-io]

Codecov Report

Merging #198 into master will decrease coverage by 0.48%. The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #198      +/-   ##
==========================================
- Coverage   95.45%   94.97%   -0.49%     
==========================================
  Files          10       10              
  Lines         374      378       +4     
==========================================
+ Hits          357      359       +2     
- Misses         17       19       +2

Impacted Files	Coverage Δ
selectable/compat.py	75% <100%> (+25%)	:arrow_up:
selectable/forms/fields.py	92.94% <0%> (-2.36%)	:arrow_down:

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[mlavin]

Thanks for this update! Is there any reason to keep <1.11 support around? Seems like it can all just :fire:

[vkurup]

awesome, I love deleting things!! I'll ping you when it's updated.

[kluchrj]

One thing I've found while testing this:

https://github.com/mlavin/django-selectable/blob/494013a6e5e1336fd841edfb43f92eb146138014/selectable/decorators.py#L53

https://github.com/mlavin/django-selectable/blob/494013a6e5e1336fd841edfb43f92eb146138014/selectable/decorators.py#L61

Django 2.0 no longer supports the user.is_authenticated() method, this needs to be changed to a property (user.is_authenticated).

[mlavin]

That's a good point @kluchrj. I don't think that is caught by the test suite because of the heavy use of Mocks. That should also be addressed.

[kluchrj]

@vkurup, not sure if you're still working on this, but I've stripped out all the <1.11 compat and fixed the issue mentioned above in my fork: https://github.com/kluchrj/django-selectable/tree/deprecations

Should I submit a pull request to replace this one?

[vkurup]

I have not had time to update this, so yes, please do submit a PR. Thanks!

[vkurup]

Superceded by #199