added user statistic

User statistic page
![image](https://cloud.githubusercontent.com/assets/7934921/5184134/72edde58-74bd-11e4-94e1-d72212f93003.png)
![image](https://cloud.githubusercontent.com/assets/7934921/5184110/4e7c8984-74bd-11e4-9524-137216ced6de.png)

commented code