open #74
Made view-switcher visible when browsing via mobile;
Fixed class in browse.html markup from left-menu to left;
Moved object-browse-bar, top-bar classes from _controls into _layout;
Renamed and simplified menu widths in mobile _constants;
Really significant refactor of mobiles/_layout;
Tweaks in user-environ/_layout;
TO-DO: figure out why object-browse-bar flex styles not
working in mobile;
c71f1fe447