Remove unused CSS classes

The classes ol-layers, ol-layer-image, and ol-layer-tile are not used.
Export ol.Map.updateSize
Merge pull request #672 from fredj/export-update-size

Export ol.Map.updateSize
Merge pull request #666 from twpayne/remove-unused-css-classes

Remove unused CSS classes
Prevent user's setting of max-width from infecting map

Thanks @ThomasG77.