Added some review notes around API.
Classification, and moves after review.
fix compile error
Remove error path from snapshot/chord/pivot as its not used
Add HdfsRepository to IvoryRetire api
Add SnapshotStorage for use through API
cli app for comparing snapshots
Added snapshotToHdfs to the IvoryRetire api
Merge pull request #67 from ambiata/topic/api-notes

Mark has reviewed, tests passing, merging