Change new functions.php to sample child theme

Remove old header image code since it is old and not
applicable to recent version of WordPress. Enqueue parent
stylesheet by default.
Remove @import's from sample child theme's style.css
Always use two decimals in docbloc @since tags
Update readme stable tag to 2.0.0
Update version number to 2.0.0
Update readme tested up to tag to 4.0
Update farsi and dutch language files