Upload component drag sort file list, and large file segment upload support.

[xpader]

期望添加上传文件分片，和文件列表拖拽排序功能。

This function solves the problem (这个功能解决的问题)

When we upload a big file, like video, iso files, segment upload can be more stable. And drag sort file list is also a useful feature.

Expected API (期望的 API)

Add some options like plupload: chunk-size: 0 means no chunk upload, and great thant 0 mean chunk size, eg: 200 mean 200kb. file-list-drag-sort: true means allow drag sort file list.

[07akioni]

We don't plan to add segment upload & sort file list currently.

[jahnli]

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