Fix a bug where content source icon sometimes wouldn’t show up

Achieving this by expose subview of a subclassed UITAbleViewCell directly, without a mediating object, which is probably a better view to approach view classes.
Support image oembeds in comment stream
display image attachments at full-size in detail view
Properly handle variable attachment sizes in detail view
Merge pull request #73 from Livefyre/dev

Support image attachments