make the maximum messages/day/user configurable with default of 50
make the maximum messages/day/user configurable with default of 50

Change-Id: I4ca31865ca235a5984fb846693366737bfa1f5f1
Reviewed-on: https://gerrit.instructure.com/5398
Tested-by: Hudson <dfb64870173313a9a7b56f814c8e3b33e268497a@instructure.com>
Reviewed-by: Brian Palmer <3cb4e1df5ec4da2c7c4af7c52cec8cf340a55a10@instructure.com>

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