Match pipes to workers

[rmccue]

Rather than relying on stream_select() giving us the array back as associative, match which worker it is manually.

Fixes humanmade/Cavalcade#6.

[rmccue]

@Djelibeybi Can you try this branch and see if it fixes your issue please? :)

Also, are you using HHVM? Seems like this is facebook/hhvm#5120

[Djelibeybi]

I'll give this a whirl later today. I'm not running HHVM, just native PHP 5.4 that ships with CentOS 6. I also tried it with PHP 7.0 build by Remi for CentOS 6 and it had the same problem.

[Djelibeybi]

Still crashes with the following error:

Feb 10 14:37:08 joy-dvmh-web-01 php: PHP Notice:  Undefined offset: 0 in /opt/Cavalcade-Runner/lib/Runner.php on line 226
Feb 10 14:37:08 joy-dvmh-web-01 php: PHP Fatal error:  Call to a member function is_done() on a non-object in /opt/Cavalcade-Runner/lib/Runner.php on line 227

FYI, for version purposes:

# /usr/bin/php -v
PHP 5.3.3 (cli) (built: Jul  9 2015 17:39:00)
Copyright (c) 1997-2010 The PHP Group
Zend Engine v2.3.0, Copyright (c) 1998-2010 Zend Technologies

[joehoyle]

I think the fatal might be related to #30