doubly user encode error fixed.
Update lib Json to SimpleJson and Chat service transactional
Add Date Util
Add login message, separate css and js
Update javascript about enter
Update AJAX about Cross Site Script
Delete header
Update javascript about empty submit
Separate javascript
Update redirect logic
Update insert chat parameter
Update chat logic about transaction
Update user entity abont setting User session
Update javascript about chat
Update HTML5
Update about style
Update css and html meta tag