[BehindKink] Add new extractor
Einthusan Add new extractor
[BehindKink] Minor fixes
 - fix _VALID_URL regex
 - remove unnecessary variable
 - remove second call of report_extraction
Merge commit '98703c7fbfcf06348220aa63f9422cdd792cfe1a'
Fixed tests
[einthusan] Add description and beautify
Credit @haricharan for einthusan (#3755)
Merge remote-tracking branch '5moufl/behindkink'
[behindkink] Remove call to report_extraction