enabled the functions to handle Private Message.
changed the colors of sender-panel and dialog related to Private Message
changed tool tip message from 'Request' to 'Message'.
fix listener clear on websocket close
Merge branch 'private-message-enhance' of github.com:haushinka2dx/atmosphere-web into private-message-enchance
Merge pull request #25 from haushinka2dx/private-message-enhance

Private message enhance