Added Route360° Library to routing section

Hey,
This is my first plugin, so I don't exactly know how this works. Our library is based on leaflet and we have used the project structure of leaflet, we implemented a custom polygon layer and added some custom controls. A demo about the capabilities can be found at the demo site: http://route360.net/project/tutorial/ Any feedback is kindly appreciated. Cheers, Daniel
Merge pull request #2785 from gerbsen/patch-1

Added Route360° Library to routing section