use more meaningful name for multi mode config group (#38)

* use a more meaningful name in multi mode am config group

* Update MultiModeAlonsoMoraConfigGroup.java

core/src/main/java/org/matsim/alonso_mora/MultiModeAlonsoMoraConfigGroup.java

@@ -8,7 +8,7 @@
 import org.matsim.core.config.ReflectiveConfigGroup;
 
 public class MultiModeAlonsoMoraConfigGroup extends ReflectiveConfigGroup {
-	public static final String GROUP_NAME = "mode";
+	public static final String GROUP_NAME = "alonso_mora";
 
 	public MultiModeAlonsoMoraConfigGroup() {
 		super(GROUP_NAME);