Fix change conflict

• Fix issue #11
  please update @change event to @Changed to fix conflict issue

Fix dragging and preview issues

Bugs fixed:

• bug after clearing all images #9
• Can't forEach file list #8
• Dragging not working #5
  Features added:
• added a button to clear all images #6

1.0.0: Merge pull request #1 from yudax42/add-license-1

-Upload files by Drag & Drop
-Upload files by clicking on the upload icon
-Add images
-Delete Images
-Append Images