#148 - Removing com.mapbox.mapboxsdk.api.Marker as it was original OSMDroid and has now been superceded by com.mapbox.mapboxsdk.overlay.Marker
#148 - Refactoring DirectedLocationOverlay to support both Direction and Simple location overlays
#148 - Removing SimpleLocationOverlay as it's now part of DirectedLocationOverlay
#148 - Renamed DirectedLocationOverlay to CoreLocationOverlay as it's more representative
Merge pull request #173 from bleege/overlaycleanup

Overlaycleanup For #148