Update RandomUtil.php

Minor API fixes to make things more flexible. 

Q	A
Bug fix?	no
New feature?	yes
BC breaks?	no
Deprecations?	no
Tests pass?	--
Fixed tickets	
License	MIT
Doc PR	--
online.tpl path fixed, closes #854.
ZikulaSecurityCenterModule naming fix, cloes #841, #842.
ZikulaSecurityCenterModule naming fix, cloes #841, #842.

There are even more issues.
Merge pull request #858 from phaidon/zikula-security-center-module-fix

ZikulaSecurityCenterModule naming fix, cloes #841, #842.
Merge pull request #857 from phaidon/user-online-block

online.tpl path fixed, closes #854.
Merge pull request #853 from rgasch/patch-11

Update RandomUtil.php