add the largest connected component code

mapbuilder/pom.xml

mapbuilder/src/main/java/map/builder/App.java

...ain/java/map/builder/osm/OSMConnectedComponentParser.java

mapbuilder/src/main/java/map/builder/osm/OSMParser.java

...c/main/java/map/builder/utilities/ComputationalUtils.java

...n/java/map/builder/utilities/ConnectedComponentGraph.java