Merge pull request #600 from Quetzacoalt91/2.x

Cast value as int for PHP 7.1

Author: glensc

min/lib/CSSmin.php

@@ -766,12 +766,12 @@ private function normalize_int($size)
     {
         if (is_string($size)) {
             switch (substr($size, -1)) {
-                case 'M': case 'm': return $size * 1048576;
-                case 'K': case 'k': return $size * 1024;
-                case 'G': case 'g': return $size * 1073741824;
+                case 'M': case 'm': return (int) $size * 1048576;
+                case 'K': case 'k': return (int) $size * 1024;
+                case 'G': case 'g': return (int) $size * 1073741824;
             }
         }
 
         return (int) $size;
     }
-}
+}