images in mail templates

When mail template contains image resulted document is corrupted (word has problems with opening it).Print_screen_smasch.pptx

assigned to @carlos.vega

mentioned in issue #235 (closed)

mentioned in commit 57bf3ced

mentioned in merge request !167 (merged)

added Done label

mentioned in commit 8ffeb47e

closed via merge request !167 (merged)

closed via commit 57bf3ced

changed milestone to %0.12.0