Fixes #981 - Closing a modal in the admin disables scrolls until a refresh
Fixes #733 - Hitting escape with one or more modals up never closes the frontmost one
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Merge branch 'BroadleafCommerce-3.0.x' into BroadleafCommerce-3.1.x
Merge branch 'BroadleafCommerce-3.1.x' into develop