Pinax-teams

* Explicitly specify template names for all apps. All templates should be grouped in "pinax/teams/" in your project template path.

* Add Django 2.0 support and compatibility testing
* Drop Django v1.8, v.1.9, v1.10 support
* Use "PINAX_TEAMS_" rather than "TEAMS_" prefix for settings
* Standardize documentation layout
* Convert CI and coverage to CircleCi and CodeCov
* Add PyPi-compatible long description
* Update installation requirements

BI change: Move `WSGITeamMiddleware` to it's own module to resolve issues with the custom app label.
This BI change was made in 0.12.2 as `WSGITeamMiddleware` had not been documented or demonstrated.

See [changelog.md](https://github.com/pinax/pinax-teams/blob/255e114e4b411cec4992761982e155786265fc08/changelog.md) for changes in this release.

See [changelog.md](https://github.com/pinax/pinax-teams/blob/a6a128e656beee71de911a3b58d07d40bd99f4a2/changelog.md) for changes in this release.

See [changelog.md](https://github.com/pinax/pinax-teams/blob/b2adde87221c454247f3c820cd71dfc849a66c1d/changelog.md) for changes in this release.