add FirePHP support about monolog

[Seldaek]

Here's a quote from a message cadorn sent me with some related links and info. Might be useful to whoever wants to jump on this (eventually I guess I will, if no one else does)

The name of the communication system is Wildfire and the protocol is identified by a URL: http://pinf.org/cadorn.org/wildfire/meta/Protocol/Component/0.1

You can find a PHP implementation of the protocol here: https://github.com/cadorn/wildfire/tree/master/packages/lib-php

To see how it is used within a library you can check out the Insight project: https://github.com/cadorn/insight/tree/master/packages/lib-php/lib/Insight

[ericclemmons]

Finished initial prototype of this, but I'm checking out the MonologBundle before making some last commits...

[Seldaek]

Resolved in Monolog, and PR waiting for the bundle symfony/symfony#648 - thanks ericclemmons.