wiki.compact: Add a basic read only view.
markdown_link_slow(): use _force_unicode
markdown_link_slow(): escape brackets
OAuth2 API: add scope/endpoints for using creddits

This adds a new OAuth2 scope, "creddits", and two endpoints that use it:

/api/v1/gold/give/{username} (with optional months amount)
/api/v1/gold/gild/{fullname}
Replace gold_creddit_escrow with creddits_lock
example.ini: Add liveupdate invite quota to example.ini.
CSS: Separate mod-specific styles from accept/leave box styles.

This is for the subreddit moderator pages but applies to contributor
pages in liveupdate.  The little moderator shield icon is the only
moderator-specific style and so this is split up to allow the general
part to be shared.
Generalize .pretty-button to non-anchor elements.
DenormalizedRelation: add missing will_write decorators.
DenormalizedRelation: add support for TTLs.
Set up some context variables when using an oauth controller.
Add optional infobar css class.
Move server seconds logic to gold.py.
Add Subreddit.gilding_server_seconds attribute.
Add subreddit gildings backfill script.
Display subreddit server seconds stat on gilded listing.