Upgrade to JastAddGradle 1.13.1

build.gradle

@@ -2,7 +2,7 @@ plugins {
   id 'java'
   id 'maven'
   id 'groovy'
-  id 'org.jastadd' version '1.12.2'
+  id 'org.jastadd' version '1.13.1'
 }
 
 if (!file('extendj/jastadd_modules').exists()) {
@@ -42,10 +42,7 @@ jastadd {
   module = 'rd-builder'
 
   astPackage = 'org.extendj.ast'
-  genDir = 'src/gen'
   parser.name = 'JavaParser'
-  parser.genDir = 'src/gen/org/extendj/parser'
-  scanner.genDir = 'src/gen/org/extendj/scanner'
 }
 
 sourceCompatibility = targetCompatibility = '1.7'