Merge pull request #346 from awolfs/master

Typo...
Merge pull request #347 from awolfs/master

Later start on saturday
added Xebialabs MV 2013 - Silver
10gen - Silver sponsor DoD MV
mozilla silver sponsor DoD MV
Add Berlin 2013 to the past events.
Merge pull request #348 from jbraeuer/master

Berlin 2013: Add to past events.
Wallpaper