Enable plagiarism check for zip files

[ellen_peters]

We are using the Turnitin similarity integration in Canvas (Canvas plagiarism framework). Currently it’s not possible to do the plagiarism check for zip files submitted in a Canvas assignment. The scenario for checking zip files could be like this:

1. Students submits a zipfile.
2. Zip file is extracted by the plagiarism framework, each individual file in zip is checked, and for each file a percentage is calculated and a report is created.
3. In the Canvas gradebook, the colour of the similarity 'flag' is based on the highest similarity score.
4. In Speedgrader, all the individual file names are shown, with their similarity scores that link to the reports.

[ProductPanda]

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