左右值无限分类相关的东东

参考文档:

http://www.sitepoint.com/hierarchical-data-database/

https://github.com/pr0cess0r/nested_sets/blob/master/nested_sets.php

https://github.com/snovichkov/kohana-nested-sets/blob/master/classes/kohana/orm/nested/sets.php

https://github.com/olimortimer/ci-nested-sets/blob/master/Nested_set.php

https://github.com/mrcasual/nested-sets-laravel-jquery

http://site.douban.com/132299/widget/notes/5582912/note/181786169/

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