Add placeholder image that is displayed when direct link is used for image that does not exist #290
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I started working on this for #13, to provide a placeholder image thumbnail in comments section in instances where user commented on deleted image. Then I split this off due to scope, as well as the fact that this would be a good feature to have in not just comments section, but also for direct link accesses too. It seems like imgur takes this approach as well, and that's what I based my implementation off of.
Other Changes:
addImagesForUser
right now. Modified User Images integ test to use this util function as well and ensured those tests still pass.