Almost there, button and scrolling working, left column needs work
Changes num-gutter to row-num-col, need name
Editor scrolling working! Now to get of the dross
Makes height perhaps more flexible, some dross gone
Some dross gone, hope it wasn't important dross
Notes, todo's
Makes textareas the right size (box-sizing)

Updated other box-sizing to be multi-browser compatible.
I'm not sure the other things that have box-sizing need them.
Style question, bit of dross gone