at.php

<?php

$genesis_atts = array(
                'nav-primary',
                'nav-secondary',
                'site-header',
                'site-inner',
                'content-sidebar-wrap',
                'content',
                'sidebar-primary',
                'sidebar-secondary',
                'archive-pagination',
                'entry-content',
                'entry-pagination',
                'site-footer',
                'nav-footer',
                'entry',
                'jumbotron-header',
                'widget'
    		);
foreach ( $genesis_att_filter as $context => $classes ) {
	$context = "genesis_attr_$context";
	add_filter( $context, 'bsg_add_markup_class', 10, 2);
}



function bsg_add_markup_class( $attr, $context ) {
    $classes = array();
	  if( has_filter('bsg-classes-to-add') ) {
        $classes = apply_filters ('bsg-classes-to-add', $classes, $context, $attr);
	  }
    $value = isset( $classes[ $context ] ) ? $classes[ $context ] : array();
    if ( is_array( $value ) ) {
        $classes_array = $value;
    } else {
        $classes_array = explode( ' ', (string) $value );
    }
    $classes_array = array_map( 'sanitize_html_class', $classes_array );
    $attr['class'] .= ' ' . implode( ' ', $classes_array );
    return $attr;
}



function pippin_add_extra_fruits( $classes ) {
	
	$extra_classes = array( 
	          'widget'                    => 'panel panel-default',
            'site-inner'                => '',
            'content-sidebar-wrap'      => 'row',
            'content'                   => 'col-sm-12 col-md-8 col-lg-9',
            'sidebar-primary'           => 'hidden-sm col-md-4 col-lg-3',
            'archive-pagination'        => 'clearfix',
            'entry-content'             => 'clearfix',
            'entry-pagination'          => 'clearfix bsg-pagination-numeric',
            'nav-footer'                => 'pull-right',
            'entry'                     => 'panel panel-default',
            'jumbotron-header'          => 'fullwidth',
            'site-footer'               => '',
            'nav-primary'               => 'navbar navbar-inverse navbar-static-top',
            'nav-secondary'             => 'navbar navbar-default navbar-static-top',
            'site-header'               => 'navbar navbar-static-top'
   	);
    
    
	//$classes = array_merge($extra_classes, $classes);
	$classes = wp_parse_args($extra_classes, $classes);

	return $classes;
	
}



function bsg_modify_classes_based_on_extras( $classes, $context, $attr ) {
   // do_action( 'add_fruits', $classes );
   $classes= pippin_add_extra_fruits($classes);
   return $classes;
}
add_filter('bsg-classes-to-add', 'bsg_modify_classes_based_on_extras', 10, 3);

atts.php

<?php

$genesis_atts = array(
                'nav-primary',
                'nav-secondary',
                'site-header',
                'site-inner',
                'content-sidebar-wrap',
                'content',
                'sidebar-primary',
                'sidebar-secondary',
                'archive-pagination',
                'entry-content',
                'entry-pagination',
                'site-footer',
                'nav-footer',
                'entry',
                'jumbotron-header',
                'widget'
    		);
foreach ( $genesis_atts as $context ) {
	$context = "genesis_attr_$context";
	add_filter( $context, 'bsg_add_markup_class', 10, 2);
}


function bsg_add_markup_class( $attr, $context ) {
    $classes = array();
	
	if( has_filter('bsg-classes-to-add') ) {
        $classes = apply_filters ('bsg-classes-to-add', $classes, $context, $attr);
	}
    $value = isset( $classes[ $context ] ) ? $classes[ $context ] : array();
    if ( is_array( $value ) ) {
        $classes_array = $value;
    } else {
        $classes_array = explode( ' ', (string) $value );
    }
    $classes_array = array_map( 'sanitize_html_class', $classes_array );
    $attr['class'] .= ' ' . implode( ' ', $classes_array );
    return $attr;
}


function pippin_add_extra_fruits( $classes ) {
	
	$extra_classes = array( 
	        'widget'                    => 'panel panel-default',
            'site-inner'                => '',
            'content-sidebar-wrap'      => 'row',
            'content'                   => 'col-sm-12 col-md-8 col-lg-9',
            'sidebar-primary'           => 'hidden-sm col-md-4 col-lg-3',
            'archive-pagination'        => 'clearfix',
            'entry-content'             => 'clearfix',
            'entry-pagination'          => 'clearfix bsg-pagination-numeric',
            'nav-footer'                => 'pull-right',
            'entry'                     => 'panel panel-default',
            'jumbotron-header'          => 'fullwidth',
            'site-footer'               => '',
            'nav-primary'               => 'navbar navbar-inverse navbar-static-top',
            'nav-secondary'             => 'navbar navbar-default navbar-static-top',
            'site-header'               => 'navbar navbar-static-top'
   	);
    
	// $classes = array_merge($extra_classes, $classes);
	$classes = wp_parse_args($extra_classes, $classes);
	
	return $classes;
	
}
// add_action('add_fruits', 'pippin_add_extra_fruits');




function bsg_modify_classes_based_on_extras( $classes, $context, $attr ) {
   // do_action( 'add_fruits', $classes );
   $classes= pippin_add_extra_fruits($classes);
   return $classes;
}
add_filter('bsg-classes-to-add', 'bsg_modify_classes_based_on_extras', 10, 3);





add_filter('bsg-classes-to-add', 'bsg_modify_classes_based_on_template', 10, 3);
function bsg_modify_classes_based_on_template( $classes, $context, $attr ) {
    $classes = bsg_layout_options_modify_classes_to_add( $classes );
    return $classes;
}

function bsg_layout_options_modify_classes_to_add( $classes ) {
    $layout = genesis_site_layout();
    // full-width-content
    if ( 'full-width-content' === $layout ) {
        $classes['content'] = 'col-sm-12';
    }
    // sidebar-content
    if ( 'sidebar-content' === $layout ) {
        $classes['content'] = 'col-sm-12 col-md-8 col-lg-9 col-md-push-4 col-lg-push-3';
        $classes['sidebar-primary'] = 'hidden-xs hidden-sm col-md-4 col-lg-3 col-md-pull-8 col-lg-pull-9';
    }
    // content-sidebar-sidebar
    if ( 'content-sidebar-sidebar' === $layout ) {
        $classes['content'] = 'col-sm-6';
        $classes['sidebar-primary'] = 'col-sm-3';
        $classes['sidebar-secondary'] = 'col-sm-3';
    }
    // sidebar-sidebar-content
    if ( 'sidebar-sidebar-content' === $layout ) {
        $classes['content'] = 'col-sm-6 col-sm-push-6';
        $classes['sidebar-primary'] = 'col-sm-3 col-sm-pull-3';
        $classes['sidebar-secondary'] = 'col-sm-3 col-sm-pull-9';
    }
    // sidebar-content-sidebar
    if ( 'sidebar-content-sidebar' === $layout ) {
        $classes['content'] = 'col-sm-6 col-sm-push-3';
        $classes['sidebar-primary'] = 'col-sm-3 col-sm-push-3';
        $classes['sidebar-secondary'] = 'col-sm-3 col-sm-pull-9';
    }
    return $classes;
};