Added vertical option

[dasdibbi]

I added the option and scss for vertical rangesliders. Not too sure about the scss, it didnt want to build for me so I used plain css while developing.

I also added a custom css file with styles fitting to the beyondadmin theme (This was mainly made for own use but somebody might like it): http://screencast.com/t/pL9MJRjOt

[dmitryshelomanov]

this PR will be adopted?

[e-purik]

please accept this PR if it is working