An attempt to fix issue #45 (`uniqid` has microsecond precision, so it is actually possible to get identical `id`, maybe it would be better to use `mt_rand` instead of `uniqid` to avoid conflicts at all)
JAMSS rule#23 gives false-positive warning for files that starts with `defined('_JEXEC')` (because of partial `exec` match) and use `$_GET` or `$_POST`. This patch requires `exec` (and other function names in) to be checked explicitly using word boundaries (`\b`) in the regex.
