Emable overriding the email template.

The HYDRA_EMAIL_TEMPLATE env var can be set to any value understood by https://metacpan.org/module/Template#process-template-vars-output-options as the $template argument.

Signed-off-by: Shea Levy <shea@shealevy.com>

Created by  Shea Levy  on July 5, 2013
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