Add @Repeatable java8 annotation support

   @MyAnnotation(value = "val1")
   @MyAnnotation(value = "val2")
   void annotatedMethod() { println("annotated method called") }

   @MyAnnotationArray({@MyAnnotation("val1"), @MyAnnotation("val2")})
   void annotatedMethod() { println("annotated method called") }

   @MyAnnotation(value = "val1")
   @MyAnnotation(value = "val2")
   void annotatedMethod() { println("annotated method called") }

import java.lang.annotation.*

class MyClass 
{
    @MyAnnotation(value = "val1")
    @MyAnnotation(value = "val2")
    //change annotation to next line and the code will work
    //@MyAnnotationArray( [@MyAnnotation("val1"), @MyAnnotation("val2")] )
    public void annotatedMethod()
    {
      System.out.println("annotated method called");
    }
   public static void main(String... args)
   {
      MyClass ob = new MyClass()
      ob.annotatedMethod()
      java.lang.reflect.Method m = ob.getClass().getMethod("annotatedMethod")
      List annos = m.getAnnotations()
      println("annos = $annos")
   }
}

@Target(ElementType.METHOD)
@Retention(RetentionPolicy.RUNTIME)
@Repeatable(MyAnnotationArray) 
public @interface MyAnnotation
{
    String value() default "val0";
}

@Retention(RetentionPolicy.RUNTIME)
public @interface MyAnnotationArray 
{
   MyAnnotation[] value()
}