Improve download and to go back when mistakes are made

[patricibal]

Hello,

I loved using you Toast UI Image Editor! And I made a pretty pixel photo.
I would like to see the download button improved, as it opened my images on another tab when clicking 'Download', and I had to right click to save it from there.
Also, when I made mistakes on the images using the pen, there was no way for me to go back. My only option was to load the image again.

I have used Google Chrome for testing.

Please let me know if you make any changes, I would love to test this again.

Thank you,
Patrici Bal