Pks/adding nivo slider

@savvysoftworks Check out the `Nivo Slider` I added :)

I found out that this slider is free when not using the wordpress plugin which is awesome!

It still needs some configuration but this thing is packed with features. like overlays and many many transitions

we can also hook it into `Nivo Lightbox` so when they click on an image it will preview it :)

Anyways this requires that you install bower components. So let me know if you have issues with the new instructions in the readme.