Split pane mode

[aikar]

I'm very pressed for time and unable to submit this as a standalone pull request, but I have added support for it in my fork here: https://github.com/aikar/input-moment

Hoping you can add this officially (so if I can get all of my changes into this repo I can go back to using yours)

Split pane mode should show both side by side as shown in my fork.

http://i.imgur.com/ncJCtI8.png