Support socket.io.

1. Add socket.io
2. Add socket.io-client.
3. Change the bin/www to support listening socket.
4. Add real games to test both server and client.
Merge pull request #1 from Kentaxer/master

Add issues and fixes section in the README.md
Fix the issue item 5 and item 4 in the same line.
Add resources of Tank.
Show real tank.
Make the Tank can be moved by direction keys.
Move realgames to games.
Support different tanks for users.
Remove the unnecessary file.
Fix an issue caused by remove the realgames.ejb.
Fixi the issues caused by removing realgames.ejs
Code Refactor.
Code refactor. Move server code to Server folder.