Description:
------------
Failed assertions should be signaled by non-zero return code from the script as they are errors.

Test script:
---------------
$ cat example.php
<?php
assert_options(ASSERT_BAIL,     true);
assert(false);
?>
$ php example.php
PHP Warning:  assert(): Assertion failed in /home/lopuszanski/projects/NK-2/tests/php/example.php on line 3
$ echo $?
0

Expected result:
----------------
echo $? should display some nonzero return code

Actual result:
--------------
0