removeSliderAt(position) function not work #88 and a NPE

1. fixed removeSliderAt(position) function not work #88
logic mistake.
2. NullPointerException in MainActivity.java
05-05 04:12:14.960      472-472/? E/AndroidRuntime﹕ FATAL EXCEPTION:
main
Process: com.daimajia.slider.demo, PID: 472
java.lang.RuntimeException: Unable to start activity
ComponentInfo{com.daimajia.slider.demo/com.daimajia.slider.demo.MainActivity}:
java.lang.NullPointerException: Attempt to invoke virtual method 'void
android.os.Bundle.putString(java.lang.String, java.lang.String)' on a
null object reference
at
android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2298)
....
Caused by: java.lang.NullPointerException: Attempt to invoke virtual
method 'void android.os.Bundle.putString(java.lang.String,
java.lang.String)' on a null object reference
at com.daimajia.slider.demo.MainActivity.onCreate(MainActivity.java:57)
at android.app.Activity.performCreate(Activity.java:5933)
at
android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1105)

demo/src/main/java/com/daimajia/slider/demo/MainActivity.java

@@ -54,8 +54,9 @@ protected void onCreate(Bundle savedInstanceState) {
                     .setOnSliderClickListener(this);
 
             //add your extra information
-            textSliderView.getBundle()
-                    .putString("extra",name);
+            if (textSliderView.getBundle() != null)
+                textSliderView.getBundle()
+                        .putString("extra",name);
 
            mDemoSlider.addSlider(textSliderView);
         }

library/src/main/java/com/daimajia/slider/library/SliderAdapter.java

@@ -49,7 +49,7 @@ public <T extends BaseSliderView> void removeSlider(T slider){
     }
 
     public void removeSliderAt(int position){
-        if(mImageContents.size() < position){
+        if(mImageContents.size() > position){
             mImageContents.remove(position);
             notifyDataSetChanged();
         }