Added more classes to bootstrap

I'm not sure if I understood correctly what's the purpose of the bootstrap file and if this is the right way of doing it.

I've noticed during the tests for symfony/symfony-standard#464 I've did that the autoloader can take quite a large number of files to load from, even with apc loader on, so I've added as many file as I've could without breaking the Welcome page or the console.

I'll do more tests about this later on today but if anyone else has a better idea/or I'm doing all sorts of wrong here then let me know.

Also, in my initial tests, this adds a nice speed bump but I'll need a better computer to confirm the initial tests.