Add max relation type. Adds HCF feature from #169.

If used, max relation should be set to -1 for the default relation.

src/main/java/com/massivecraft/factions/Faction.java

@@ -134,6 +134,8 @@ public interface Faction extends EconomyParticipator {
 
     public void setRelationWish(Faction otherFaction, Relation relation);
 
+    public int getRelationCount(Relation relation);
+
     // ----------------------------------------------//
     // Power
     // ----------------------------------------------//