add stackprof gem to get rid of nag
add stackprof gem to get rid of nag

Change-Id: Iec6d16d6beba7a1089b5e257554dd3dfff421131
Reviewed-on: https://gerrit.instructure.com/56741
Reviewed-by: Simon Williams <088e16a1019277b15d58faf0541e11910eb756f6@instructure.com>
Reviewed-by: Brian Palmer <3cb4e1df5ec4da2c7c4af7c52cec8cf340a55a10@instructure.com>
Product-Review: Brian Palmer <3cb4e1df5ec4da2c7c4af7c52cec8cf340a55a10@instructure.com>
QA-Review: Brian Palmer <3cb4e1df5ec4da2c7c4af7c52cec8cf340a55a10@instructure.com>
Tested-by: Jenkins

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