Static file creation fails if the requested url has url encoded parts

[eHtmlu]

Usually an URL like
/1467084520/b=path/to/minify&f=quick-test.js
could also be written as
/1467084520/b%3Dpath%2Fto%2Fminify%26f%3Dquick-test.js

Such a request works fine as long as the static file is already created. But it fails for file creation.

My suggestion is to urldecode the $query part as shown below:

/static/gen.php (lines 50 - 56)
currently:

// "1467084520"
$requested_cache_dir = $m[1];

// "b=path/to/minify&f=quick-test.js"
$query = $m[2];

suggestion:

// "1467084520"
$requested_cache_dir = $m[1];

// "b=path/to/minify&f=quick-test.js"
$query = urldecode($m[2]);