Fix PHP Notice and remove extract() function
Fix PHP Notice and remove extract() function

Remove extract() function for shortcode attributes as is recommended for plugins and themes and has been adopted by WordPress core (see https://core.trac.wordpress.org/ticket/22400).
Fix PHP Notice: undefined variable $title on several lines
MWDelaney/bootstrap-3-shortcodes,filipstefansson/bootstrap-3-shortcodes,MWDelaney/bootstrap-3-shortcodes,MWDelaney/bootstrap-3-shortcodes,filipstefansson/bootstrap-3-shortcodes