New field: Whether or not to include an expandable first post for
embedded content.
Interface for expanding OP contents
Remote fetching of blog contents
Adds better reusable error message support. Added to fetching remote
posts. /cc @riking
Minor tweaks to importing first posts
Allow the `content_sha1` column of `topic_embed` to be nullable
BUGFIX: reload site settings on rails reload in dev
fixing blockquotes in composer preview
Merge pull request #2221 from awesomerobot/master

fixing blockquotes in composer preview
Minor refactor of cooked_post_processor.rb to improve CodeClimate score

Added instance variable @elems which contains html element/tag/attribute tuples
Used @elems to eliminate duplicate code in keep_reverse_index_up_to_date
and in optimize_urls methods