adapt WordPress plugin readme
convert tabs to spaces
rename function.php methods to Pullquote, remove copyright setting
convert tabs to spaces
rename core.php method hooks; rename span to .pullquote-source
remove faux locale support
remove pullquote_admin_url because there's no need to administer
slim down PHP contents

- tidy PHP files
- fix JS issue introduced in da000966975b44e0ad9eafcb440d0b20c05c3f9f