Design details

Assorted small fixes:
* fix height of select boxes for OS X @karlitschek 
* shift files app breadcrumbs to account for missing app list
* by @raghunayyar: Adds Animation to Toggling Navigation on < 768px widths
* by @MorrisJobke: add OC.menuSpeed to control the animation speed of menu toggle
* remove unused table sizing CSS
* fix misalignment of modified dates, shift to right @MorrisJobke 
* more subtle hover effect on sortable column, text instead of background @PVince81 @karlitschek 

Please review @owncloud/designers