Add resize module (#451)

* added resize module - without test

* Added resize test, deleted unused value in blend test (which I've added before)

* Fixed test

* Fixed test

* added modules file

* added imagejs to package

* removed test - not able to check width and height of the element

* Changed resize calculations

src/modules/Resize/Module.js

@@ -0,0 +1,71 @@
+/*
+ * Resize the image by given percentage value
+ */
+module.exports = function Resize(options, UI) {
+
+    var output;
+
+    function draw(input, callback, progressObj) {
+
+        options.resize = options.resize || "125%";
+
+        progressObj.stop(true);
+        progressObj.overrideFlag = true;
+
+        var step = this;
+
+        var imagejs = require('imagejs');
+
+        function changePixel(r, g, b, a) {
+            return [r, g, b, a]
+        }
+
+        function extraManipulation(pixels) {
+            // value above 100% scales up, and below 100% scales down
+            var resize_value = parseInt(options.resize.slice(0, -1));
+
+            var new_width,
+                new_height;
+
+            new_width = Math.round(pixels.shape[0] * (resize_value / 100));
+            new_height = Math.round(pixels.shape[1] * (resize_value / 100));
+
+            var bitmap = new imagejs.Bitmap({width: pixels.shape[0], height: pixels.shape[1]});
+            bitmap._data.data = pixels.data;
+
+
+            var resized = bitmap.resize({
+                width: new_width, height: new_height,
+                algorithm: "bicubicInterpolation"
+            });
+
+            pixels.data = resized._data.data;
+            pixels.shape = [new_width,new_height,4];
+            pixels.stride[1] = 4 * new_width;
+
+            return pixels;
+        }
+
+        function output(image, datauri, mimetype) {
+            // This output is accesible by Image Sequencer
+            step.output = { src: datauri, format: mimetype };
+        }
+
+        return require('../_nomodule/PixelManipulation.js')(input, {
+            output: output,
+            changePixel: changePixel,
+            extraManipulation: extraManipulation,
+            format: input.format,
+            image: options.image,
+            inBrowser: options.inBrowser,
+            callback: callback
+        });
+    }
+
+    return {
+        options: options,
+        draw: draw,
+        output: output,
+        UI: UI
+    }
+}