Traduction de `installation.md`#3

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Kocal merged 4 commits intovuejs-fr:workingfrom

Kocal:installation.md

May 9, 2017

Commits on May 5, 2017

Commits on May 6, 2017

Traduction de "dev build"
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Commits on May 8, 2017

Changement pour s'aligner avec l'`installation.md` de Vuex
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