Echoing forked process output to stdout on demand

[Antoniossss]

Resolves #11

[mikehaertl]

@Antoniossss See schmunk42@1606eef#commitcomment-16438471. We don't want this class to echo out anything.

[Antoniossss]

@mikehaertl That is why it is on demand + output is bufferer anyway.
This may be not the exact feature that has been requested, but in my case, i needed such feature - forked process is a really long running one, and live output is must be to see if everything is running smoothly.

[schmunk42]

@Antoniossss

Here's a snippet from my code....

    public function status($name)
    {
        $command = $this->createCommand();
        $command->addArg('status');
        $command->addArg($name);

        $this->execute($command->getExecCommand());
    }

    private function execute($command)
    {
        // "real time" output
        echo $command."\n";

        $handle = popen($command, 'r');
        while (!feof($handle)) {
            echo fgets($handle);
        }
        pclose($handle);
    }

[mikehaertl]

@Antoniossss Let's continue discussion in #11.