title: How to detect if a marker is inside a polygon in google maps
body: <p>I've got loads of coordinates for a polygon in a database. I also have coordinates for an marker in my database.
  How do i detect if the marker is inside this polyon. </p>
  
  <p>Note: I use a cronjob to move the marker, and in this cronjob it needs to detect this. So javascript isn't involved!</p>
  
  <p>Shape of polygon is not just a circle or square. It could be for example a country or sea.</p>