Zoomy fixed feature

![screenshot](https://f.cloud.github.com/assets/1738309/89816/c635d2f2-6554-11e2-8a1b-33f32e780706.png)

display Zoomy on a fixed position (ie besides the image) on the page with new options:
{
fixed: true,
fixedX: 300,
fixedY: 0
}