No one reads the pylint reports, we just want the messages.
setUp and tearDown don't need docstrings.
More ways to mark arguments as unused.

More tweaks

The most common error is Amazon SES having blacklisted an email address.
However, we handle any error being raised during user.email_user.

Fixes JIRA LMS-131

Start linting envs files, add task to only pylint errors, and move pylintrc file to the correct location