fixed crash when loading neutral faction; skills.json no longer requires index values

config/schemas/skill.json

@@ -29,10 +29,6 @@
         "required" : ["basic", "advanced", "expert"],
 
         "properties": {
-            "index":{
-                "type": "number",
-                "description": "numeric id of skill required only for original skills, prohibited for new skills"
-            },
             "basic":{
                 "$ref" : "#/definitions/skillBonus"
             },

config/skills.json

@@ -1,6 +1,5 @@
 {
     "estates" : {
-        "index" : 13,
         "basic" : {
             "description" : "Hero generates 250 gold each day.",
             "effects" : [