Add a section on front controllers and the AppKernel#2465

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mpdude wants to merge 7 commits intosymfony:masterfrom

webfactory:front-controllers-and-kernel

Commits on Apr 4, 2013

Commits on Apr 5, 2013

Commits on Apr 6, 2013

Not mention the Debug Component until it's ready
mpdude
committed

Commits on Apr 7, 2013

Mentioning the Debug component again as it has just been merged into master.
mpdude
committed