Honor email_always even if notification has been read

Even if the notification has been read, send it by email if user has enabled email_always
Added test to ensure email is sent to users with email_always set even if the notification has been read
Corrected typo, corrected accidental tab, removed unnecessary database rollback

Corrected it "do send" to it "does send"
Removed unnecessary user.update_column (rollback happens automatically)
Replaced Tab with spaces.
BUGFIX: bypass fulltext for search in topic
Merge pull request #2422 from peternlewis/honor_email_always_even_if_read

Honor email_always even if notification has been read
minor copyedits on community flag hide pm
strip font-family from pre/code on mobile
BUGFIX: link colors on topic lists
FIX: subcategory badge styling problems
Make ?preview-style make sense

New behavior:
?preview-style=(sha) -- see that stylesheet
?preview-style= -- see the currently selected stylesheet
?preview-style=default -- see the default stylesheet ("rescue mode")
Merge pull request #2458 from riking/previews

Make ?preview-style make sense
DEBUG: Send all email processing errors to admins
FIX: Use secondary category color for stripes when only showing the
stripe.
Add group icon to restricted parent categories
Merge pull request #2459 from riking/email

DEBUG: Send all email processing errors to admins
FEATURE: overlay the banner when reading a topic
TRIVIAL: remove default 'Read more' link in the banner
BUGFIX: prevent invisible topic from being pinned or becoming a banner