add support for supplying multiple public keys, in order to gracefully support certificate rotation#240

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thepeachbeetle wants to merge 3 commits intojwtk:masterfrom thepeachbeetle:master

+280-74

Commits on Jul 25, 2017

add support for supplying multiple public keys that will be attempted when validating a token signature
thepeachbeetle
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remove some <>'s and undo some accidental codestyle changes
thepeachbeetle
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Commits on Jul 26, 2017

tests
thepeachbeetle
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