added imageSizeMapping to config.dist.php
added imageSizeMapping to config.dist.php

sgulseth/drpublish-imbo-app,sgulseth/drpublish-imbo-app,aptoma/drpublish-imbo-app,sgulseth/drpublish-imbo-app,aptoma/drpublish-imbo-app,aptoma/drpublish-imbo-app