[OHAI-509] fix build date parsing from php if php patched with suhosin:

$ php -v
PHP 5.3.27 with Suhosin-Patch (cli) (built: Aug 30 2013 04:30:30)
Copyright (c) 1997-2013 The PHP Group
Zend Engine v2.3.0, Copyright (c) 1998-2013 Zend Technologies

Conflicts:
	lib/ohai/plugins/php.rb
[OHAI-358] add test for php version parse
update test with current master

test passes:
$ ruby -S rspec spec/unit/plugins/php_spec.rb

Conflicts:
	spec/unit/plugins/php_spec.rb
Merge branch 'OHAI-358'