deps: completely upgrade npm in LTS to 2.15.1#5988

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othiym23 wants to merge 1 commit intonodejs:v0.12-stagingfrom npm:npm-2.15.1-node-0.12-revised

+123-120

Commits on Apr 1, 2016

deps: completely upgrade npm in LTS to 2.15.1
othiym23
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