Added convenience init?(firstPredicate : NSPredicate, secondPredicate: NSPredicate, predicateOperator: NSPredicateOperator )
Added  convenience init?(attribute: String!, value: [AnyObject])  to NSPredicate
Added class func predicateBuilder(attribute: String!, value: AnyObject, predicateOperator: NSPredicateOperator ) -> NSPredicate?
and improved: PokemonFactory, findFirstOrCreateWithAttribute
Added NotEqual to predicateBuilder
Added GreaterThan, GreaterThanOrEqual, LessThan and LessThanOrEqual to predicateBuilder
Added enum NSLogicOperator : String