Fixed some bugs in utility scripts

util/compute_FontAwesome_subset.php

 <?php
 
+$root = preg_replace('/\/[^\/]+$/', '', dirname(__FILE__));
 $directories = [
-	"./"
+	"{$root}/src/"
 ];
 $files = [ 
 	"options.js",

util/package.php

 
 	$command = "cd {$root}/build/{$platform}; ";
 	$command .= "find . -type f -name '.DS_Store' -delete; ";
+	$command .= "mkdir -p {$root}/release; ";
 	$command .= "tar czf {$root}/release/AlwaysKillSticky-{$platform}-{$version}.tar.gz *; ";
 	$command .= "zip -r -FS {$root}/release/AlwaysKillSticky-{$platform}-{$version}.zip *";
 	`{$command}`;