Code cleanup, re-organizing and tidying (#226)

* initial cleanup

* build

* additions and build

src/modules/Channel/Module.js

@@ -0,0 +1,58 @@
+/*
+ * Display only one color channel
+ */
+module.exports = function Channel(options,UI) {
+
+  options = options || {};
+  options.channel = options.channel || "green";
+
+  // Tell UI that a step has been set up
+  UI.onSetup(options.step);
+  var output;
+
+  function draw(input,callback,progressObj) {
+
+    progressObj.stop(true);
+    progressObj.overrideFlag = true;
+
+    // Tell UI that a step is being drawn
+    UI.onDraw(options.step);
+    var step = this;
+
+    function changePixel(r, g, b, a) {
+      if (options.channel == "red")   return [r, 0, 0, a];
+      if (options.channel == "green") return [0, g, 0, a];
+      if (options.channel == "blue")  return [0, 0, b, a];
+    }
+
+    function output(image,datauri,mimetype){
+
+      // This output is accesible by Image Sequencer
+      step.output = {src:datauri,format:mimetype};
+
+      // This output is accessible by UI
+      options.step.output = datauri;
+
+      // Tell UI that step ahs been drawn
+      UI.onComplete(options.step);
+    }
+
+    return require('../_nomodule/PixelManipulation.js')(input, {
+      output: output,
+      changePixel: changePixel,
+      format: input.format,
+      image: options.image,
+      inBrowser: options.inBrowser,
+      callback: callback
+    });
+
+  }
+
+  return {
+    options: options,
+    //setup: setup, // optional
+    draw:  draw,
+    output: output,
+    UI: UI
+  }
+}