Dev.UI bootstrap

通用社区UI结构设计

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  brand                        user     -> navbar navbar-inverse
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   20px
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  logo        |    banner adv          
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  20px
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  nav                        search    --> navbar navbar-default
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  20px
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  breadcrumb                           -> breadcrumb
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  20px
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 Page content 
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 footer                               ->  pi-footer
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