Added options to show/hide controls and pagination

I've moved the HTML from javascript to the haml template, I don't like having HTML in the javascript files... 
Why remove the conditional here? If you remove it then all that happens is the logic goes into the function, meaning an unnecessary call and creation of a couple of variables. Plus the function contents have to live inside an if statement. Personally I would say that `this.config.showSliderControls && this._showControls()` is much cleaner.