Performance tuning for retrieving redundancies
Revise data-structure for ring
Revise data-structure for ring - add next-addr-id
Optimize worker's codes
To correct func-name and replace from magic-number to constant-val
Implement first-func in worker
Implement last-func in worker
Implement lookup-func (80%)
Refactor - remove unnecessary property from ring_group-record
Modify retrieving redundancies from source of ring, which is ets or mnesia
Implement lookup-func (DONE)
Replace type of lookup-func's return-value
Fix gen-routing-table's bug
Replace c-hash's redaundant function
Revise default # of vnodes for the test
Modify test-cases for the worker
Modify test-cases for the worker
Optimize codes due to changed worker's related codes
Merge branch 'feature/chash-performance-tuning-2' into develop