add beginnings of a splashscreen
fix an autobug

0	java.lang.NullPointerException
1	at com.android.internal.app.ActionBarImpl$ActionModeImpl.invalidate(ActionBarImpl.java:867)
2	at com.geeksville.andropilot.gui.WaypointActionMode.com$geeksville$andropilot$gui$WaypointActionMode$$spinnerListener$1(WaypointActionMode.scala:222)
3	at com.geeksville.andropilot.gui.WaypointActionMode$$anonfun$onPrepareActionMode$2.apply(WaypointActionMode.scala:224)
4	at com.geeksville.andropilot.gui.WaypointActionMode$$anonfun$onPrepareActionMode$2.apply(WaypointActionMode.scala:224)
5	at com.ridemission.scandroid.AdapterViewExtensions$$anon$4.onItemSelected(AndroidUtil.scala:49)