Added Mario and Stefan.
<email>oschweitzer@me.com</email>
<timezone>1</timezone>
</contributor>
+ <contributor>
+ <name>Stefan Sedlmair</name>
+ <timezone>1</timezone>
+ </contributor>
+ <contributor>
+ <name>Mario Viehmann</name>
+ <email>marioviehmann@gmail.com</email>
+ <timezone>1</timezone>
+ </contributor>
<contributor>
<name>William Wong</name>
<email>william1104@gmail.com</email>
