修复Select通过HTML设定selectedIndex属性无效的问题

Fixed #244
修复activeIndex从HTML中定义时无效的问题

Fixed #243
修复一堆jshint错误
修复Tree的indicateNodeLoading的实现错误
Merge branch '3.1.0-dev' of github.com:ecomfe/esui into 3.1.0-dev