Implement `isFeatureEnabled` API#132

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wangjoshuah merged 10 commits intomasterfrom

josh.wang/isFeatureEnabled_refactor

Aug 15, 2017

Commits on Aug 10, 2017

abstract sending the impression event
wangjoshuah
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support isFeatureEnabled API. add variationIdToExperiment mapping in project config
wangjoshuah
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Commits on Aug 12, 2017

add integration-ish test for isFeatureEnabled when bucketed into an experiment and make sure we send an impression event
wangjoshuah
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Commits on Aug 14, 2017

fix confusing commit
wangjoshuah
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