Adding zoom to airport

Fixes #7
Adding CameraZoomer class to provide zooming to airport.
Adding a button in path list to trigger the zoom.
Adding Routes

Adding data and classes to represent airports destinations
Updating Cesium to latest version
Merge remote-tracking branch 'master/master' into louis

Updating to the newest version
added link to wikipedia
Merge pull request #2 from lpoignant/louis

Louis