mod 更新

1. 修复 mod-amd  被 uglify 压缩后，出现的 bug
2. 添加 mod-ls 即 localstorage 版本。
我也是看了这段注释，换成了 4.
> Using a non-zero value because of concern for what old browsers
> do, and latest browsers "upgrade" to 4 if lower value is used:
> http://www.whatwg.org/specs/web-apps/current-work/multipage/timers.html#dom-windowtimers-settimeout