Pinax-comments

* [Release Notes](https://github.com/pinax/pinax-comments200)

* Remove django-user-accounts from test requirements

* Replace deprecated render_to_string() `context_instance` kwarg
* Add view tests
* Add templatetag tests

* add django>=1.11 requirement
* update testing requirements
* improve documentation markup
* remove "static" and "templates" dirs from MANIFEST.in
* fix badge target links

* Add Django 2.0 compatibility testing
* Drop Django 1.9, 1.9, 1.10 and Python 3.3 support
* Move documentation into README, standardize documentation layout
* Convert CI and coverage to CircleCi and CodeCov
* Add PyPi-compatible long description
* Add documentation for templatetags and signals
* Add usage example