submit powerpoint files to turnitin
submit powerpoint files to turnitin

closes CNVS-21734

Test plan:
  * enable turnitin for an assignment
  * submit a powerpoint file (ppt and/or pptx)
  * get a turnitin score

Change-Id: I29e56094a507600a8d14a449dc6d9d7b5cbfeb6d
Reviewed-on: https://gerrit.instructure.com/62655
Tested-by: Jenkins
Reviewed-by: Josh Simpson <bfb4987b134a00f73d881fff5113b1d5fa1876bc@instructure.com>
QA-Review: Jason Carter <976bfc4bed0555ff96b3266aea18e7b17a9d471c@instructure.com>
Product-Review: Cameron Matheson <1d572acbfa68c7c6e541c7b840d6b622e5c0dc91@instructure.com>

venturehive/canvas-lms,leftplusrightllc/canvas-lms,narigone/canvas,narigone/canvas,instructure/canvas-lms,leftplusrightllc/canvas-lms,snehakachroo1/LSI_replica,AndranikMarkosyan/lms,SwinburneOnline/canvas-lms,fronteerio/canvas-lms,instructure/canvas-lms,matematikk-mooc/canvas-lms,redconfetti/canvas-lms,djbender/canvas-lms,sfu/canvas-lms,grahamb/canvas-lms,SwinburneOnline/canvas-lms,redconfetti/canvas-lms,roxolan/canvas-lms,fronteerio/canvas-lms,redconfetti/canvas-lms,sfu/canvas-lms,sfu/canvas-lms,AndranikMarkosyan/lms,narigone/canvas,grahamb/canvas-lms,venturehive/canvas-lms,roxolan/canvas-lms,roxolan/canvas-lms,snehakachroo1/LSI_replica,fronteerio/canvas-lms,matematikk-mooc/canvas-lms,dgynn/canvas-lms,grahamb/canvas-lms,sfu/canvas-lms,instructure/canvas-lms,matematikk-mooc/canvas-lms,narigone/canvas,venturehive/canvas-lms,dgynn/canvas-lms,djbender/canvas-lms,instructure/canvas-lms,HotChalk/canvas-lms,instructure/canvas-lms,venturehive/canvas-lms,AndranikMarkosyan/lms,leftplusrightllc/canvas-lms,HotChalk/canvas-lms,AndranikMarkosyan/lms,snehakachroo1/LSI_replica,SwinburneOnline/canvas-lms,sfu/canvas-lms,leftplusrightllc/canvas-lms,redconfetti/canvas-lms,HotChalk/canvas-lms,dgynn/canvas-lms,instructure/canvas-lms,sfu/canvas-lms,roxolan/canvas-lms,HotChalk/canvas-lms,fronteerio/canvas-lms,dgynn/canvas-lms,instructure/canvas-lms,djbender/canvas-lms,snehakachroo1/LSI_replica,djbender/canvas-lms,SwinburneOnline/canvas-lms,sfu/canvas-lms,matematikk-mooc/canvas-lms,grahamb/canvas-lms,grahamb/canvas-lms