[Maintenance] Dependency updates, node 7 testing#26

Merged

wuhkuh merged 10 commits intomqttjs:masterfrom wuhkuh:master

Mar 16, 2017

+103-97

Commits on Mar 16, 2017

Update license year to 2017
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Fix typo
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Add node 7 to tests
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Update docs
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Fix errors
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Update dependencies
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Update error messages
wuhkuh
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Fix contributor link
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Add Peter Sorowka as contributor
wuhkuh
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Pushed version to 5.2.2, added contact info
wuhkuh
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