Fixed robot stadium samples
Added hint in order to show how to add push buttons to the cross-compilation
Renamed libzip to avoid possible name clashes
Renamed webots development directory
Ignored files
Merge pull request #269 from fabienrohrer/master

Fixed robot stadium samples
Merge pull request #270 from DavidMansolino/PushButton

Added hint in order to show how to add push buttons to the cross-compilation