Added .classpath files.

1:
Since `.project` file is present, `.classpath` is required as well.
Otherwise, you get odd result when importing what Eclipse considers to be an existing project.

2:
Happens when wrapped in a  *chrisbanes/Android-PullToRefresh*.
```
FATAL EXCEPTION: main
java.lang.ClassCastException: android.widget.FrameLayout cannot be cast to com.emilsjolander.components.stickylistheaders.WrapperView
	at com.emilsjolander.components.stickylistheaders.StickyListHeadersListView.scrollChanged(StickyListHeadersListView.java:405)
	at com.emilsjolander.components.stickylistheaders.StickyListHeadersListView.access$3(StickyListHeadersListView.java:350)
	at com.emilsjolander.components.stickylistheaders.StickyListHeadersListView$3.onScroll(StickyListHeadersListView.java:95)
	at android.widget.AbsListView.invokeOnItemScrollListener(AbsListView.java:1340)
	at android.widget.AbsListView.trackMotionScroll(AbsListView.java:4949)
	at android.widget.AbsListView$FlingRunnable.run(AbsListView.java:4087)
	at android.view.Choreographer$CallbackRecord.run(Choreographer.java:749)
	at android.view.Choreographer.doCallbacks(Choreographer.java:562)
	at android.view.Choreographer.doFrame(Choreographer.java:531)
	at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:735)
	at android.os.Handler.handleCallback(Handler.java:725)
	at android.os.Handler.dispatchMessage(Handler.java:92)
	at android.os.Looper.loop(Looper.java:137)
	at android.app.ActivityThread.main(ActivityThread.java:5041)
	at java.lang.reflect.Method.invokeNative(Native Method)
	at java.lang.reflect.Method.invoke(Method.java:511)
	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
	at dalvik.system.NativeStart.main(Native Method)

```