Fix the error caused by the same path and alias of RouteConfig#2462

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chenfengjw163 wants to merge 4 commits intovuejs:devfrom

chenfengjw163:dev

Commits on Nov 1, 2018

Fix the error caused by the same path and alias of RouteConfig
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Commits on Nov 8, 2018

warning path with the same value as an alias
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fix flow check
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Commits on Nov 20, 2018

path alias same warning in development
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