implementing socket.io interface

finished: GET/POST/PUT/DELETE on collection
implement APIs corresponding to "#name/:_id" route on top of socket.io
route ":name/:_id/:_column" on socket.io
add test for multiple model
refactor
implement subscribe collection
add a websocket flag to enable all these socket.io things
typo
trying to fix memory leak warning
add chatroom example
make chat example easier to setup
extract socket related functions to separate module
fix notification listener leak
add README
put upsert test back
Merge pull request #45 from poga/master

Implement Socket.io interface