Added borders to images
Added borders to images

I tried to add some style changing on selection but I realized that I
need to watch for so many events. I will try it again soon.

tt-acm/DesignExplorer,tt-acm/DesignExplorer,MingboPeng/DesignExplorer,serenayl/DesignExplorer,MingboPeng/DesignExplorer,serenayl/DesignExplorer