Add method Tracker#loop
Add class Protocol
Add constants of tracker statuses to class Frame
Modify server.coffee to catch exeption raised from websocket.io#write
Create class Connection separated from class Tracker
Add references to internal modules as member variables of class EyeTribe
Modify Connection#handleResponse to support multiple json response
Modify Heartbeat#start to use intavalMillis got from Tracker Server
Modify argument checking logic at Tracker#set and get
Modify method Tracker#get add callback handler, and start heartbeat at Tracker#connect instead of Connection#connect
Release version 0.1.1