Updated flattened and hover selectors

Hover selector now dynamically calculates its width and maxWidth;
Flattened selector now have its search-box under the field label
(options controlled);
Flattened selector now re-renders upon window.resize event;
Per-column filters are removed from comment.extension.js;
ToDo:(datagrid)
1.Change per-column sort to be local after user has input vals in search
box;
2.Add show/hide column widget to datagrid;