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The old name was `student.send_activation_email`. The new name is now `common.djangoapps.student.tasks.send_activation_email`. We no longer user the old task name, so we can safely stop registering it with Celery workers, without fear of dropping any lingering tasks under the old name.
common ------ This directory contains common code shared between LMS and CMS, such as Mako templates, CSS, and Coffescript.