Fix pagination test

- Add template context processor for request to test settings,
as paginator tag assumes request will be in the context.
- Add a check in the paginator module for that setting, so folks
will get a useful error if they don't have that processor
configured.
Remove `under development` warning from 0.12.0 release notes
Point at .12 version of project template

In the instructions for installing from the project template, update
the URL to install using the release-0.12.0 version of the template.
Removed extraneous stylesheet
Merge in 0.12.0 release branch
Fixes conflict in 0.12.0 release branch