$this->msgIssueLike(); needs to be called after calling $this->_count(); otherwise the number of likes will never be updated

Signed-off-by: Suki <suki@missallsunday.com>
Pass js=1 on template_like directly since we already know we can use js
use dots for concatenation

Signed-off-by: Suki <suki@missallsunday.com>
Docblocks for Like class
add a callback param to _validLikes for external likes to update their data without the need to use another hook

Signed-off-by: Suki <suki@missallsunday.com>