add maximum number of sub-processus which will be run simultaneously option

[jubianchi]

:+1:

[FlorianLB]

Same debate here : https://github.com/atoum/AtoumBundle/pull/40

So, we can merge it and we will see later...

[jubianchi]

@FlorianLB I was searching for this issue :)

I also think we can merge this one and improve it later. Tests should be green as I pushed a fix on the master branch. A tiny rebase will make everything green (cc @flavien-effinet).

I'm alsoworking on an argument mapper wich will allow us to easily bind atoum args to symfony command options/arguments. I'll try to let you know more about that soon.

[flavien-metivier]

build travis ok

[FlorianLB]

Thx