新增jsonp callback name的检测

Signed-off-by: hancong03 <hancong03@baidu.com>
Merge branch 'dev-1.4.0' of github.com:fex-team/ueditor into dev-1.4.0
Merge remote-tracking branch 'origin/dev-1.4.0' into dev-1.4.3
修复单图上传按钮和jquery表单验证不兼容的问题