Merge pull request #67 from elifesciences/tweaks

Tests for python package imports.
Merge pull request #68 from elifesciences/tweaks

Typos.
Publish JPG file workflow.
Merge pull request #72 from elifesciences/publish-jpg

Publish JPG file workflow.
bot_bucket settings.
Change email queue to use S3 to store email body.
Merge pull request #73 from elifesciences/email-queue

Email queue