Android Maps Extensions Demo

-- version 1.4.0 --* new navigation layout* comes with Android Maps Extensions 2.0-- version 1.3.1 --* fixed bug when Google Play services app is not available-- version 1.3 --* added example demonstrating potential use of Marker.setClusterGroup with Marker.animatePosition to create marker spidifier effect similar to http://jawj.github.io/OverlappingMarkerSpiderfier/demo.html