Removes unnecessary 'this' references to class fields
Removes unused code
Removes resource leak
Removes resource leaks
Adds serialVersionUID, for serialization
Updates generics
Corrects call of static method
Removes unused imports
Removes unused imports
Adds serialVersionUID
Add unit tests
Removes unused imports
Removes unused code
Corrects check now on Map (was HashMap)
System.in should not be closed ... :)
Adds missing enum entry ROAD
Replace concreate class with interfaces.
Merge pull request #145 from verhagen/master

Updates Introduction
edited spelling/grammar
Merge pull request #146 from verhagen/improve-code-generics

Improve code generics and removes resource leaks