Adicionado as classes Tile e PointD

app/src/main/java/ufpr/inf/pet/geoloc/PointD.java

+package ufpr.inf.pet.geoloc;
+
+/**
+ * Created by pet on 20/05/15.
+ */
+public class PointD {
+
+    private double x;
+    private double y;
+
+    public double getX() {
+        return x;
+    }
+
+    public void setX(double x) {
+        this.x = x;
+    }
+
+    public double getY() {
+        return y;
+    }
+
+    public void setY(double y) {
+        this.y = y;
+    }
+
+    @Override
+    public String toString() {
+        StringBuilder sb = new StringBuilder();
+        sb.append("(").append(x).append(",").append(y).append(")");
+        return sb.toString();
+    }
+}