+
+Based on: Simulating Markers with a Tile Layer
+Author: John Coryat http://www.usnaviguide.com/ws-2010-08/
+
+also described in video: http://www.youtube.com/watch?v=hNbFkLuRk5Y
+
+
+My modifications are desribed in following blog post:
+
+http://blog.rot13.org/2011/04/google-map-data-layer-using-custom-tiles.html
+
INSTALL
# create database