Implement get total size and count
Remove the node ID aggregating dimension
Add a test to getTotalCountForNode()
Implement getAggregatedResults()
Remove the API to get detailed storage usage for a specific node
Remove one more by-node API
Implement itemized storage and more tests
Rename StorageLocation... to StorageUsage...
One more fix to remove the for-node API
Merge pull request #488 from eric-wu/storage

Restore some of the storage usage APIs