v0.4.1: fixed some errors in defense logic

src/com/shatteredpixel/shatteredpixeldungeon/items/KindOfWeapon.java

@@ -104,7 +104,7 @@ abstract public class KindOfWeapon extends EquipableItem {
 		return 1;
 	}
 
-	public int defenceFactor( Hero hero ) {
+	public int defenseFactor(Hero hero ) {
 		return 0;
 	}
 	

src/com/shatteredpixel/shatteredpixeldungeon/items/weapon/melee/Greatshield.java

@@ -38,7 +38,7 @@ public class Greatshield extends MeleeWeapon {
 	}
 
 	@Override
-	public int defenceFactor(Hero hero) {
+	public int defenseFactor(Hero hero) {
 		return 10+3*level();    //10 extra defence, plus 3 per level;
 	}
 }

src/com/shatteredpixel/shatteredpixeldungeon/items/weapon/melee/Quarterstaff.java

@@ -38,7 +38,7 @@ public class Quarterstaff extends MeleeWeapon {
 	}
 
 	@Override
-	public int defenceFactor(Hero hero) {
+	public int defenseFactor(Hero hero) {
 		return 2;	//2 extra defence
 	}
 }

src/com/shatteredpixel/shatteredpixeldungeon/items/weapon/melee/RoundShield.java

@@ -38,7 +38,7 @@ public class RoundShield extends MeleeWeapon {
 	}
 
 	@Override
-	public int defenceFactor(Hero hero) {
+	public int defenseFactor(Hero hero) {
 		return 5+2*level();     //5 extra defence, plus 2 per level;
 	}
 }

src/com/shatteredpixel/shatteredpixeldungeon/items/weapon/melee/Sai.java

@@ -39,7 +39,7 @@ public class Sai extends MeleeWeapon {
 	}
 
 	@Override
-	public int defenceFactor(Hero hero) {
+	public int defenseFactor(Hero hero) {
 		return 3;	//3 extra defence
 	}
 }