Vertical carousel functionality plus demo theme

Added functionality for vertical carousel. Option carousel:'vertical' will do plus adds class 'vertical' to galleria container. (Helpful, for theme with horizontal and vertical carousel as option) 
Added modified classic theme, called 'vertical' to show in action.
![vertical](https://f.cloud.github.com/assets/1646034/190028/949af7ea-7ec2-11e2-92e5-e79cd409d601.png)