support aspect ratio transformation param

Author: itaibenari

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

@@ -326,6 +326,18 @@ public Transformation zoom(float value) {
 	public Transformation zoom(double value) {
 		return param("zoom", new Double(value));
 	}
+	
+	public Transformation aspectRatio(double value) {
+		return param("aspect_ratio", new Double(value));
+	}
+	
+	public Transformation aspectRatio(String value) {
+		return param("aspect_ratio", value);
+	}
+	
+	public Transformation aspectRatio(int nom, int denom) {
+		return aspectRatio(Integer.toString(nom) + ":" + Integer.toString(denom));
+	}
 
 	public Transformation responsiveWidth(boolean value) {
 		return param("responsive_width", value);
@@ -469,6 +481,7 @@ public String generate(Map options) {
 		String[] simple_params = new String[] {
 				"ac", "audio_codec",
 				"af", "audio_frequency",
+				"ar", "aspect_ratio",
 				"bo", "border",
 				"br", "bit_rate",
 				"cs", "color_space", 

cloudinary-core/src/test/java/com/cloudinary/test/CloudinaryTest.java

@@ -883,6 +883,19 @@ public void testVideoTagWithPoster() {
 		assertEquals(expectedTag, actualTag);
 
 	}
+	
+	@Test
+	public void testAspectRatio() {
+		String actual = cloudinary.url().transformation(new Transformation().aspectRatio("1.5"))
+				.generate("test");
+		assertEquals(DEFAULT_UPLOAD_PATH + "ar_1.5/test", actual);
+		actual = cloudinary.url().transformation(new Transformation().aspectRatio(1.5))
+				.generate("test");
+		assertEquals(DEFAULT_UPLOAD_PATH + "ar_1.5/test", actual);
+		actual = cloudinary.url().transformation(new Transformation().aspectRatio(3,2))
+				.generate("test");
+		assertEquals(DEFAULT_UPLOAD_PATH + "ar_3:2/test", actual);
+	}
 
 	public static Map<String, String> getUrlParameters(URI uri) throws UnsupportedEncodingException {
 		Map<String, String> params = new HashMap<String, String>();