#368 - Setting up ItemizedIconOverlay Test infrastructure
#368 - Adding markers to map via itemizediconoverlay.  Successfully replicates crash.
#368 - Saving reference to MapView in Marker constructor
#368 - Making setDefaultMarkerOverlay() use same addItemizedOverlay() infrastructure
#368 - Making MapView.addItemizedOverlay() mimic MapView.addMarker() process by adding all existing Markers on ItemizedIconOverlay to the MapView at initial setup.
Merge pull request #369 from mapbox/itemoverlaytest

Merging In Fix For ItemizedIconOverlay