fixed gc overhead limit in chord
Merge pull request #257 from ambiata/fix-chord

fixed gc limit bug in chord
Remove unused NotImplemented.generate
Remove unused imports
Introduce SnapshotWritable for sorting by time/priority and remove PriorityTag
fixup! Introduce SnapshotWritable for sorting by time/priority and remove PriorityTag
Use repo.snapshot in PrintFactsSpec
Add byConcrete combinator in Dictionary
Add Mutator
Introduce SnapshotPartitions
Support snapshot windows
fixup! Support snapshot windows
fixup! Support snapshot windows
fixup! Support snapshot windows
fixup! Support snapshot windows
fixup! Support snapshot windows

- Fix SnapshotReducerSpec by removing duplicate entities
FeatureReduction and Squash