Bugfix: Make find a class method instead of an instance method
Bugfix: Make find a class method instead of an instance method

When we call the standard `ActiveRecord.find` it's on the class, not the
instance so `Persistable` needs to reflect that fact.

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Change-Id:     I78d2c478429dde615b154a5e38dacf6b96d5ef46
Signed-off-by: Jeff Felchner <8a84c204e2d4c387d61d20f7892a2bbbf0bc8ae8@thekompanee.com>

jasnow/human_error,jasnow/human_error