contains method
return true if the given point
was inside the bounds.
Implementation
bool contains(LatLng point) {
bool h,v;
if (east>west){
h=point.lng >= west &&
point.lng <= east;
}else{
h=(point.lng >= west && point.lng<=180)||
(point.lng <= east&&point.lng>=-180);
}
v=point.lat <= north &&
point.lat >= south;
return h&&v;
}