implement a feature of `defaultLang`(#497)#500

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JounQin wants to merge 5 commits intovuejs:masterfrom

JounQin:master

Commits on Nov 26, 2016

Commits on Dec 4, 2016

Merge https://github.com/vuejs/vue-loader
JounQin
committed

Commits on Feb 9, 2017

merge from https://github.com/vuejs/vue-loader.git
JounQin
committed