Make Sure the Sitewide blacklist saves.

The `seoal_blacklist_max` filter now actually returns false by default.

Fixes #15
Add a CSS class to automatically added links

Fixes #18
Bump readme and plugin versions and update the changelog
Merge remote branch 'upstream/master'
Re-apply VIP changes to fix the apply_filters call in inc/admin.php

A previous merge overwrote this change, so this brings our github repo up-to-date and in sync with the upstream version.