Implement block-list in url validator
Refactor code to allow other responses more easily
Also allow "blocked" response
Added tests for url validator blocked
boyscouting: added missing newline
Added test for medium.com blocking.
remove redundant quotes

Address @markijbema's syntax "error"
use difference approval name
Remove dead code
Fix approvals with new non-clashing names
Merge pull request #9 from Factlink/block-medium

Block medium