use strings for crocodoc user ids
use strings for crocodoc user ids

closes CNVS-26881

Change-Id: I4645503ff5cfc869d8dae0fec88aabe470fbb4d5
Reviewed-on: https://gerrit.instructure.com/71107
Reviewed-by: Zach Wily <9de8c4480303b5335cd2a33eefe814615ba3612a@instructure.com>
Tested-by: Jenkins
QA-Review: KC Naegle <9fbecd016338f9910821a8a5d5d0ae4fc9abfaa5@instructure.com>
Product-Review: Cameron Matheson <1d572acbfa68c7c6e541c7b840d6b622e5c0dc91@instructure.com>

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