add concept skech
update depency
add websocket support without test.
rename apis.
suppress warning when WebSocket enabled.
add more simplified api.
add WebSocket test.
add more tests
Merge pull request #4 from taichi/websocket

add Websocket Features
add WebSocket example to README.md
remove comment.
update update to 0.1.0
Merge branch 'master' of https://github.com/taichi/siden