Adds Crop and Watermark mutations

Mutation.h

@@ -101,4 +101,41 @@ public:
 	string ToString() {
 		return "Brighten";
 	}
+};
+
+//shaves off some pixels from the bottomright edge of the image
+class Crop : public Mutation {
+public:
+	Image * getMutated(Image* img) {
+		Image* mut = new Image(*img);
+		ssize_t n = mut->rows();
+		ssize_t m = mut->columns();
+		float shave = 0.1;
+		n *= 1.0 - shave;
+		m *= 1.0 - shave;
+		mut->crop(Geometry(m, n, 0, 0));
+		return mut;
+	}
+	string ToString() {
+		return "Crop";
+	}
+};
+
+//Adds a logo to the top-left corner of the image
+class Watermark : public Mutation {
+public:
+	Watermark() {
+		watermark = new Image;
+		watermark->read("watermark.png");
+	}
+	Image * getMutated(Image* img) {
+		Image* mut = new Image(*img);
+		mut->composite(*watermark, "+10+10", OverCompositeOp);
+		return mut;
+	}
+	string ToString() {
+		return "Watermark";
+	}
+private:
+	Image* watermark;
 };