Remove bootstrap layout dependency

Now our code is much much simpler

check 
https://github.com/happypeter/onestep/blob/b36637cefbfe8a66f2692e883fc7b9be0685cd0f/app/assets/stylesheets/plugins/bootstrap.css.scsshttps://github.com/happypeter/onestep/blob/b36637cefbfe8a66f2692e883fc7b9be0685cd0f/app/assets/stylesheets/plugins/bootstrap.css.scss

to see what has been removed.