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

* initial cleanup

* build

* additions and build

src/ReplaceImage.js

@@ -1,3 +1,5 @@
+// Uses a given image as input and replaces it with the output.
+// Works only in the browser. 
 function ReplaceImage(ref,selector,steps,options) {
   if(!ref.options.inBrowser) return false; // This isn't for Node.js
   var tempSequencer = ImageSequencer({ui: false});