Added Less Framework 4

Addition of the Less Framework 4 (http://lessframework.com/) to CSS frameworks on top of changes to the CSS frameworks code refactoring by swalkinshaw in commit 539198a.

inc/roots-actions.php

@@ -93,6 +93,8 @@ function roots_get_stylesheets() {
 		$styles .= "\t<noscript>\n";
     $styles .= stylesheet_link_tag('/adapt/mobile.css', 1);
 		$styles .= "\t</noscript>\n";
+	} elseif ($roots_css_framework === 'less') {
+    $styles .= stylesheet_link_tag('/less/less.css');
 	}
 
 	if (class_exists('RGForms')) {

inc/roots-options.php

@@ -99,6 +99,15 @@ $roots_css_frameworks = array(
       'sidebar' => 'grid_4'
     )
   ),
+  'less' => array(
+		'name'     => 'less',
+		'label'   => __('Less Framework 4', 'roots'),
+    'classes' => array(
+      'container' => 'container',
+      'main'    => 'grid_6',
+      'sidebar' => 'grid_4'
+    )
+  ),
   'none' => array(
 		'name'     => 'none',
 		'label'   => __('None', 'roots'),