Addresses issue treehouse-projects#6 choosing number of examples

Author: jscriptor09

src/main/java/com/teamtreehouse/flashy/controllers/IndexController.java

@@ -12,6 +12,7 @@
 
 @Controller
 public class IndexController {
+  public static final int AMOUNT_TO_SHOW = 3;
   private FlashCardService flashCardService;
 
   @Autowired
@@ -22,12 +23,13 @@ public void setFlashCardService(FlashCardService flashCardService) {
   @RequestMapping("/")
   public String index(Model model) {
     StringBuilder ctaBuilder = new StringBuilder();
-    List<FlashCard> cards = flashCardService.getRandomFlashCards(5);
+    List<FlashCard> cards = flashCardService.getRandomFlashCards(AMOUNT_TO_SHOW);
     ctaBuilder.append("Refresh your memory about ");
     for (FlashCard card : cards) {
       ctaBuilder.append(card.getTerm());
       if (card != cards.get(cards.size() - 1)) {
         ctaBuilder.append(", ");
+
       }
     }
     ctaBuilder.append(" and ");