Merge pull request #541 from atlasapi/events-filter

Add a list of whitelisted event ids, which the events API will now filter for.
Merge pull request #542 from atlasapi/km-topics

Guess Atlas topics from KM keyphrases
Fix KM topic resolution

The TopicCreatingTopicResolver doesn't actually write them, apparently
Merge branch 'fix-km-topic-resolution' into stage