1.2.12

Add a more complete fix for PHP 7 not working with declare(ticks = 1). This means this branch is no longer compatible with PHP 7.0 and below at all since this function was added in 7.1. Some useful links:

https://bugs.php.net/bug.php?id=71448
http://php.net/manual/en/function.pcntl-async-signals.php