minor digest email copyedits
improve test email error message
BUGFIX: add h2 with period when browsing top pages
BUGFIX: only redirect users top /top page once
clarify register account
better first boot register admin account help
Update INSTALL-digital-ocean.md
incorrect image urls in guide
TRIVIAL: remove puts statement (cc. @eviltrout)
Add a SiteSetting to configure how many topics are in the email digest.
FIX: Link to user profile broke the back button
BUGFIX: if SSO is enabled invite system is disabled
FEATURE: custom fields on User
Display username and granted at on badge page.
Move badge styles from desktop to common/base.
Merge pull request #2287 from vikhyat/badge-system

Display username and granted_at on badge page
BUGFIX: pull hotlinked images job wasn't properly handling the InvalidParameters exception
BUGIFX: generate avatars when using S3 store
Don't show link counts in the body of posts for internal links. They are
already in the sidebar.
Allow admins to choose if groups are visible or not.