Expand NewsBlur rule to cover blurblogs

NewsBlur provides what it calls "Blurblogs", which are separate per-user
subdomains displaying each user's shared stories in a blog-like format. HTTPS
is available on these subdomains, as well as the already known www and dev
subdomains. However, there is also an 'icons' subdomain which uses an invalid
(Amazon S3) certificate.
[NewsBlur] Downgrade rule for sub-subdomain

Global shared stories are at popular.global.newsblur.com which unfortunately
doesn't match the *.newsblur.com wildcard, and doesn't have its own cert.
[NewsBlur] Rewrite aliased S3 bucket
[NewsBlur] Another S3 bucket.
Merge branch 'rule-newsblur' of https://github.com/jmorahan/https-everywhere into jmorahan-rule-newsblur