Java: Clean up public Java API

[marcoroth]

import org.herb.*;

public class Main {
  public static void main(String[] args) {
    String template = "<div><%= @user.name %></div>";

    LexResult lexResult = Herb.lex(template);
    System.out.println(lexResult.inspect());

    ParseResult parseResult = Herb.parse(template);
    System.out.println(parseResult.inspect());
  }
}