Removing console.log

In the production code, I'd rather not be forced to `console.log` the results of my image request. In this, I added a conditional to the coffeescript file that allows for getting debug output via `CKEDITOR.config.simpleImageBrowserDebug`.

Because there is no published build process for compiling the minified version, I only commented out the `console.log` part - if you add a build step to the readme, or even better, in Grunt or Gulp, I'd be happy to compile the new version as well.