Add dashicons added between v4.1 and v4.7

[bobbingwide]

Changes discovered by comparing wp-includes/css/dashicons.css in v4.1 and v4.7 lead to the following additions being required in bw_list_dashicons.

// New in WordPress up to 4.7
$di[] = "filter";
$di[] = "admin-customizer";
$di[] = "admin-multisite";
$di[] = "image-rotate";
$di[] = "image-filter";
$di[] = "editor-table";
$di[] = "unlock";
$di[] = "hidden";
$di[] = "sticky";
$di[] = 'excerpt-view';  // Now corrected
$di[] = "move";
$di[] = "plus-alt2";
$di[] = "warning";
$di[] = "laptop";
$di[] = "thumbs-up";
$di[] = "thumbs-down";
$di[] = "layout";
$di[] = "paperclip";