Add Threshold fulfillments#119

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future-is-present wants to merge 6 commits intomasterfrom

threshold-fulfillments

Commits on Nov 3, 2017

fulfillment with values
manolodewiner
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create makeFulfillment
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Commits on Nov 5, 2017

sign therhold condition
manolodewiner
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Commits on Nov 6, 2017

fulfillment null for test_cryptocondition
manolodewiner
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Commits on Nov 8, 2017

Add test makeFulfillment
manolodewiner
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Commits on Nov 21, 2017

Added generic setThreshold for thresholdFulfillment
manolodewiner
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