Plagiabot provides an API for testing articles with the Turnitin engine (see https://en.wikipedia.org/wiki/Wikipedia:Turnitin). Here is an example of the API output for a specific article: http://tools.wmflabs.org/eranbot/plagiabot/api.py?action=suspected_diffs&page_title=Rajesh_Khanna&report=1
It would be great if the Copyvio Detector tool (https://tools.wmflabs.org/copyvios/) had the option of using Turnitin as well as Yahoo BOSS for detecting possible copyright violations.
Acceptance criteria:
* In the "Copyvio search" options, add a new option for "Use Turnitin"
* If "Use Turnitin" is checked, include source URLs from the Plagiabot API output in the "Checked Sources" list
* Source URLs that are detected by both Turnitin and Yahoo should only be shown in the list once
For now, we should only use the Plagiabot API as a source for more source URLs to compare using the Copyvio Detector engine. For the sake of consistent output (that isn't mixing apples and oranges), we should not use Plagiabot's score or reports (at least for now), but should use the score and diffs generated by the Copyvio Detector engine.