Add Transformation::toString()

Author: tocker

cloudinary-core/src/main/java/com/cloudinary/Transformation.java

@@ -382,10 +382,23 @@ public Transformation param(String key, Object value) {
 		return this;
 	}
 
+	/**
+	 * Serialize this transformation object as a string
+	 *
+	 * {@code
+	 * Transformation().width(100).height(101).generate(); // produces "h_101,w_100"
+	 * }
+	 * @return a String representation of the transformation
+	 */
 	public String generate() {
 		return generate(transformations);
 	}
 
+	@Override
+	public String toString() {
+		return generate();
+	}
+
 	public String generate(Iterable<Map> optionsList) {
 		List<String> components = new ArrayList<String>();
 		for (Map options : optionsList) {