support Facebook kid_directed_site flag for social plugins. remove custom styles for social plugins loaded with each page
add comment-form class to comment box to better match default theme stylings
add extra class comment-respond to Comments Box wrapper to improve compatibility with theme styling
update social plugin setters by casting form variables to their most appropriate type. remove border color as it is no longer supported by Facebook social plugins. parse widget instance properties using wp_parse_args with default fallback values
merge master
Merge pull request #454 from niallkennedy/social-plugins

update social plugins for July 2013 values