Refactor safeguards

[pims]

Pang, we need to refactor the safeguard stuff. It is not easy to reason about.

suripu/suripu-core/src/main/java/com/hello/suripu/core/util/TimelineUtils.java

Line 1008 in b809087

public static List<Optional<Event>> sleepEventsHeuristicFix(final List<Event> sleepEvents, final Map<MotionFeatures.FeatureType, List<AmplitudeData>> features){