Add a splash screen on startup

To make a splash screen work using phonegap we add a .png image to the file:
phonegap/platforms/android/res/drawable
This update adds one line,
super.setIntegerProperty("splashscreen", R.drawable.splash);
(Note: R.drawable."pngFileNameGoesHere") and updates another line to define the duration that we should show the splash screen
 super.loadUrl("file:///android_asset/www/index.html", 4000);
in the
phonegap/platforms/android/src/com/domain/projectName/projectName.java 
file.