Add get/setEntries API to Chord class
Fix bug
Modify ping interface
Now any peer which retains replicas can respond to retrieval requests.
Fix bug of chord.retrieve
Now listeners of 'data' or 'close' are set to conn object after 'open' event
fired.
Add config.maximumNumberOfAttemptsOfNotifyAndCopyOnJoin.
Now ID.maxId and .minId are cached.
Optimize ID.js
Add #add, #sub and #getIntervalInPowerOfTwoFrom methods to ID.
Improve FingerTable's performance
Now FingerTable precreates localId.addPowerOfTwo(i)
Remove #_{get,set,unset}Entry from FingerTable
Refactor SuccessorList.js
Refactor ID.js
Refactor FingerTable.js
Refactor ReferenceList.js and add test cases
Replace Underscore.js with Lo-Dash
Merge pull request #10 from jure/lodash

Replace Underscore.js with Lo-Dash
Update chord-monitor to use Lo-Dash