Extension repository system is ready

Dear Yii Folks,

The extension repository system is now ready. You may share your Yii extensions using this system. Please let us know if you suggestions or find any problems using this system. We wish the system can grow to a degree that can provide everyone extensions needed to build up Web applications.

Cheers!

Qiang

Would be nice to add posibility to give extension names with uppercase letters, digits and ‘-’ symbol