typos

![screenshot_2014-04-01-04-26-38](https://cloud.githubusercontent.com/assets/812995/2575083/f8ffc160-b946-11e3-9fb9-6bdbe014e9eb.png)
![screenshot_2014-04-01-04-25-59](https://cloud.githubusercontent.com/assets/812995/2575084/f90ff3d2-b946-11e3-8365-ff36c2b246ef.png)


+ delete unneeded pngs