html5 drag and drop supported
fix clear image not working issue
Allow adding more images later if browser supports
Fix file uploaded by javascript not saved issue
Ignore images that are already added
Add timestamp to filename

avoid possible cache problem for cdn when image is created after deleting an old one and the same filename is used
escape filename
Show images added
Restructure

Allow remove image from image list; escape filename for html safe;
workaround webkit input maxlength limit
Set type=number for numeric options
Resize images in image list for better performance
Add drag and drop area
Allow selecting all images when editing comments
Move javascript to footer
Styling input field
Add progress indicator for adding image