first mobile style rules, hide extra columns in files view and scroll header
remove min-width rule to fix mobile views
reuse file upload as used within files app - remove public upload button
fixing preview generation
no new menu on public upload
remove unused js code and css rules
add download button on single file share page
improvements to public files mobile view
remove unused log icon
tweak color and position of username in public share
fix public share download button width
show publicly shared image on full width, without margin
on mobile, show single shared image at full width without margin
add icons for file list and picture view toggles
optimize size of toggle icons
restrict zooming on mobile devices for the publicly accessible, optimized pages
make sure there's enough room for the file actions
fix input element closing tag
remove unused variable
Merge branch 'master' into mobile-style

Conflicts:
	apps/files/js/files.js
	apps/files_sharing/css/public.css
	apps/files_sharing/js/public.js
	apps/files_sharing/templates/public.php