added suport of Chrome Version 25.0.1323.0 canary
Merge pull request #6 from coderaiser/patch-1

added suport of Chrome Version 25.0.1323.0 canary
Update example/index.html

comment "rtc.attachStream(stream, 'you');"
Merge pull request #9 from feiyunruyue/master

comment the repeated code
Merge pull request #1 from webRTC/master

同步更新。