change a text
remove over after dropping images from web
Merge pull request #1 from teambition/fix-drag-web-image

remove over after dropping images from web
Merge pull request #544 from teambition/master

修复无效拖拽没有去除遮罩的问题
change to html5 doctype
language change to zh-CN
revert error fix
Merge pull request #555 from SunLn/fix_error_text

小改动
update