/models/: fixed a bug with article model where article history would not allow creating empty article entries
/views/css/ & /views/pages/user/: added a CSS class to add padding between page sections
/views/css/: changed CSS class name for better coherency
/views/css/: made images use 100% block width tops
/views/css/: removed top margin before page footer (related to 222ad9d)
/views/: added placeholder for right menu
/views/pages/home/: modified content to comply better to the new design (WIP, featured article only, design not definitive)