[c2]: Image upload prepends images to replies in IE11 [finish #75544978] 

Originally reported [here](https://getsatisfaction.com/getsatisfaction/topics/new_interface_issue_with_uploading_photos_while_using_ie_11). Steps to reproduce:
- Type a few words into a reply in IE11
- Insert an image using the file selection option (not drag and drop)

Expected result:
- The image is inserted at the cursor's position

Actual result:
- The image is inserted at the beginning of the reply
 https://www.pivotaltracker.com/story/show/75544978