Merge pull request #14 from Reva-B98/main_abhishek

Fixed issue #13

src/main/java/de/dennisguse/opentracks/introduction/IntroductionActivity.java

@@ -78,7 +78,7 @@ public Fragment createFragment(int position) {
                 return fc.newInstance();
             }
 
-            throw new RuntimeException("There isn't Fragment associated with the position: " + position);
+            throw new IllegalArgumentException("There isn't Fragment associated with the position: " + position);
         }
 
         @Override