expire the mini calendar cache at the top of every hour, fixes #4204
expire the mini calendar cache at the top of every hour, fixes #4204

Change-Id: If02de705c7229a84f3da6de9da8596f824bf1525
Reviewed-on: https://gerrit.instructure.com/3864
Tested-by: Hudson <dfb64870173313a9a7b56f814c8e3b33e268497a@instructure.com>
Reviewed-by: Bracken Mosbacker <48b846001bca4166dc3fb7711563afc17525921e@instructure.com>

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