Collapse layer controls on smaller screens

[StefanBrand]

On my FP1 (4.3" screen) take up quite some space and seem to be constantly in the way.

[StefanBrand]

Leaflet 1.x makes this a lot easier in my opinion because they introduced two new methods to layer controls:

• collapse()
• expand()

Edit: We might as well collapse the layer controls by default since the layer control button is quite obvious, IMO: http://leafletjs.com/examples/layers-control/