Comment on why we clear cell's chest

Let people know in the source code why we clear out a cell's chest when
a prisoner in there is released.

src/main/java/com/graywolf336/jail/PrisonerManager.java

@@ -504,6 +504,8 @@ public class PrisonerManager {
                     Util.restoreInventory(player, prisoner);
                 }
             }else {
+                //Clear out the cell's chest just in case
+                //they decided to store something there
                 if(cell.hasChest()) cell.getChest().getInventory().clear();
             }