Basic features implemented:
method erzeugeOrtsListe
method erzeugeTextausgabeReiseroute
method ermittleRoutennutzkosten
method bestimmeAnderenOrt

method ermittleBesteRoute not finished yet! it is set up for the first
hop.
Merge pull request #13 from rbrueckner93/Ruben_Flugroute

Basic features implemented: