Added cross_intl_date_line? method to Polygon
Added kml with polygon which crosses international date line
added rechart! method to Point class
Added unit tests for rechart! method
Added unit tests for #cross_intl_date_line?
Documented #rechart!
Modified #contains_point? so that it works for polygons crossing the International Date Line
Added unit test for #contains_point? for case when polygon crosses date line