merged branch drak3/process-control (PR #3681)

Commits
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f9f51a5 fixed cs
af65673 [Process] Added support for non-blocking process control Added methods to control long running processes to the Process class:  - A non blocking start method to startup a process and return    immediately  - A blocking waitForTermination method to wait for the processes    termination  - A stop method to stop a process started with start All status-getters like getOutput were changed to return real-time data

Discussion
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[Process] Added support for non-blocking process control

Bug fix: no
Feature addition: yes
Backwards compatibility break: no
Symfony2 tests pass: yes [![Build Status](https://secure.travis-ci.org/drak3/symfony.png?branch=process-control)](http://travis-ci.org/drak3/symfony)
Fixes the following tickets: #1049
Todo: -

Added methods to control long running processes (as described in issue #1049) to the Process class:
 - A non blocking start method to startup a process and return
   immediately
 - A blocking waitForTermination method to wait for the processes
   termination
 - A stop method to stop a process started with start
All status-getters like getOutput were changed to return real-time data

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by Seldaek at 2012-03-23T10:52:30Z

Overall this seems like a good improvement. I didn't check the code in detail though.

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by drak3 at 2012-03-23T11:21:45Z

@stof @Seldaek thanks, fixed