Update GlobalCssJs to latest wmf/1.24wmf18

Changes:
* e4a5d01 - Support usernames with spaces in them <Kunal Mehta>
* 1d83326 - Add script to delete user global.js/css includes <Kunal Mehta>

Change-Id: I5fdaa27c1260ce21d238eef037f05d0e509b3920