Specify toggle button and dynamic sizing of toggles.

I was looking around on the new bumblebee setup and decided to play around. I added an extra toggle button to remove the left panel, much like the 'hide 3rd col' button on the right side, so that it would feel similar to ADS1.0.

Also made the resizing of the middle panel dynamic, based on the sizes of the left and right panels. Unfortunately I cannot see what it looks like with real data without access to the database. It renames correctly to col-md-12, but may not look as nice as it was intended.

The old code remains there uncommented for reference/preference.