Sound fragment redesign

Jenkins Testrun: http://catrobatgw.ist.tugraz.at:8080/job/Catroid-custom-branch-test/552/

![Screenshot_2013-03-14-01-42-02](https://f.cloud.github.com/assets/1889789/257007/cad2c0fa-8c40-11e2-9d90-855361759763.png)

![Screenshot_2013-03-14-01-42-17](https://f.cloud.github.com/assets/1889789/257013/dbb25a20-8c40-11e2-95ee-a4b95b7a115c.png)