Bug fixes and small quaility improvements

Bug fixes

Minor bug fixes

Small fix

Various fixes and quality improvements

Release 1.9, new features and bugfixes

Various fixes and small improvements

Releaser v1.8 - underground stations now supported and multi-city highway building

Publish 1.7, fixes and a cool new feature - quad track with express lines

Adds a couple of features to allow better management and creation of bus lines